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Finding the Fourth Proportional to 85,641.76, 128,140.08 and 59,397.28

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Solution

The fourth proportional to 85,641.76, 128,140.08 and 59,397.28 is: 88,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,641.76 : 128,140.08 = 59,397.28 : x
  2. Step 2: Convert to fraction form
    85,641.76/128,140.08 = 59,397.28/x
  3. Step 3: Cross multiply
    85,641.76x = 128,140.08 × 59,397.28
  4. Step 4: Simplify right side
    85,641.76x = 7,611,172,210.98
  5. Step 5: Solve for x
    x = 7,611,172,210.98/85,641.76
  6. Step 6: Final answer
    x = 88,872.21

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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.