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Finding the Fourth Proportional to 21,045.60, 31,541.60 and 11,189.60

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Solution

The fourth proportional to 21,045.60, 31,541.60 and 11,189.60 is: 16,770.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,045.60 : 31,541.60 = 11,189.60 : x
  2. Step 2: Convert to fraction form
    21,045.60/31,541.60 = 11,189.60/x
  3. Step 3: Cross multiply
    21,045.60x = 31,541.60 × 11,189.60
  4. Step 4: Simplify right side
    21,045.60x = 352,937,887.36
  5. Step 5: Solve for x
    x = 352,937,887.36/21,045.60
  6. Step 6: Final answer
    x = 16,770.15

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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.