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Finding the Fourth Proportional to 66,490,978.80, 99,736,468.20 and 40,981,810.80

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Solution

The fourth proportional to 66,490,978.80, 99,736,468.20 and 40,981,810.80 is: 61,472,716.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490,978.80 : 99,736,468.20 = 40,981,810.80 : x
  2. Step 2: Convert to fraction form
    66,490,978.80/99,736,468.20 = 40,981,810.80/x
  3. Step 3: Cross multiply
    66,490,978.80x = 99,736,468.20 × 40,981,810.80
  4. Step 4: Simplify right side
    66,490,978.80x = 4,087,381,069,632,616.50
  5. Step 5: Solve for x
    x = 4,087,381,069,632,616.50/66,490,978.80
  6. Step 6: Final answer
    x = 61,472,716.20

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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.