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Finding the Fourth Proportional to 85,440.10, 128,160.15 and 49,864.90

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Solution

The fourth proportional to 85,440.10, 128,160.15 and 49,864.90 is: 74,797.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,440.10 : 128,160.15 = 49,864.90 : x
  2. Step 2: Convert to fraction form
    85,440.10/128,160.15 = 49,864.90/x
  3. Step 3: Cross multiply
    85,440.10x = 128,160.15 × 49,864.90
  4. Step 4: Simplify right side
    85,440.10x = 6,390,693,063.74
  5. Step 5: Solve for x
    x = 6,390,693,063.74/85,440.10
  6. Step 6: Final answer
    x = 74,797.35

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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.