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Finding the Fourth Proportional to 144,915.60, 217,470.60 and 85,688.40

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Solution

The fourth proportional to 144,915.60, 217,470.60 and 85,688.40 is: 128,590.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,915.60 : 217,470.60 = 85,688.40 : x
  2. Step 2: Convert to fraction form
    144,915.60/217,470.60 = 85,688.40/x
  3. Step 3: Cross multiply
    144,915.60x = 217,470.60 × 85,688.40
  4. Step 4: Simplify right side
    144,915.60x = 18,634,707,761.04
  5. Step 5: Solve for x
    x = 18,634,707,761.04/144,915.60
  6. Step 6: Final answer
    x = 128,590.07

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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.