Home / 21,431.07-32,146.29-12,999.57

Finding the Fourth Proportional to 21,431.07, 32,146.29 and 12,999.57

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Solution

The fourth proportional to 21,431.07, 32,146.29 and 12,999.57 is: 19,499.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,431.07 : 32,146.29 = 12,999.57 : x
  2. Step 2: Convert to fraction form
    21,431.07/32,146.29 = 12,999.57/x
  3. Step 3: Cross multiply
    21,431.07x = 32,146.29 × 12,999.57
  4. Step 4: Simplify right side
    21,431.07x = 417,887,947.10
  5. Step 5: Solve for x
    x = 417,887,947.10/21,431.07
  6. Step 6: Final answer
    x = 19,499.16

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.