Home / 21,218.16-31,827.03-12,900.47

Finding the Fourth Proportional to 21,218.16, 31,827.03 and 12,900.47

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Solution

The fourth proportional to 21,218.16, 31,827.03 and 12,900.47 is: 19,350.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.16 : 31,827.03 = 12,900.47 : x
  2. Step 2: Convert to fraction form
    21,218.16/31,827.03 = 12,900.47/x
  3. Step 3: Cross multiply
    21,218.16x = 31,827.03 × 12,900.47
  4. Step 4: Simplify right side
    21,218.16x = 410,583,486.57
  5. Step 5: Solve for x
    x = 410,583,486.57/21,218.16
  6. Step 6: Final answer
    x = 19,350.57

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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.