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Finding the Fourth Proportional to 107,915.10, 161,872.65 and 85,607.70

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Solution

The fourth proportional to 107,915.10, 161,872.65 and 85,607.70 is: 128,411.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,915.10 : 161,872.65 = 85,607.70 : x
  2. Step 2: Convert to fraction form
    107,915.10/161,872.65 = 85,607.70/x
  3. Step 3: Cross multiply
    107,915.10x = 161,872.65 × 85,607.70
  4. Step 4: Simplify right side
    107,915.10x = 13,857,545,259.41
  5. Step 5: Solve for x
    x = 13,857,545,259.41/107,915.10
  6. Step 6: Final answer
    x = 128,411.55

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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.