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Finding the Fourth Proportional to 85,421.70, 128,132.55 and 77,127.30

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Solution

The fourth proportional to 85,421.70, 128,132.55 and 77,127.30 is: 115,690.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,421.70 : 128,132.55 = 77,127.30 : x
  2. Step 2: Convert to fraction form
    85,421.70/128,132.55 = 77,127.30/x
  3. Step 3: Cross multiply
    85,421.70x = 128,132.55 × 77,127.30
  4. Step 4: Simplify right side
    85,421.70x = 9,882,517,623.62
  5. Step 5: Solve for x
    x = 9,882,517,623.62/85,421.70
  6. Step 6: Final answer
    x = 115,690.95

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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.