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Finding the Fourth Proportional to 19,687.60, 29,531.40 and 18,612.40

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Solution

The fourth proportional to 19,687.60, 29,531.40 and 18,612.40 is: 27,918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,687.60 : 29,531.40 = 18,612.40 : x
  2. Step 2: Convert to fraction form
    19,687.60/29,531.40 = 18,612.40/x
  3. Step 3: Cross multiply
    19,687.60x = 29,531.40 × 18,612.40
  4. Step 4: Simplify right side
    19,687.60x = 549,650,229.36
  5. Step 5: Solve for x
    x = 549,650,229.36/19,687.60
  6. Step 6: Final answer
    x = 27,918.60

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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.