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Finding the Fourth Proportional to 77,020.20, 115,530.30 and 71,115.30

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Solution

The fourth proportional to 77,020.20, 115,530.30 and 71,115.30 is: 106,672.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,020.20 : 115,530.30 = 71,115.30 : x
  2. Step 2: Convert to fraction form
    77,020.20/115,530.30 = 71,115.30/x
  3. Step 3: Cross multiply
    77,020.20x = 115,530.30 × 71,115.30
  4. Step 4: Simplify right side
    77,020.20x = 8,215,971,943.59
  5. Step 5: Solve for x
    x = 8,215,971,943.59/77,020.20
  6. Step 6: Final answer
    x = 106,672.95

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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.