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Finding the Fourth Proportional to 99,679,922.40, 149,358,920.40 and 56,420,479.20

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Solution

The fourth proportional to 99,679,922.40, 149,358,920.40 and 56,420,479.20 is: 84,539,610.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,679,922.40 : 149,358,920.40 = 56,420,479.20 : x
  2. Step 2: Convert to fraction form
    99,679,922.40/149,358,920.40 = 56,420,479.20/x
  3. Step 3: Cross multiply
    99,679,922.40x = 149,358,920.40 × 56,420,479.20
  4. Step 4: Simplify right side
    99,679,922.40x = 8,426,901,861,762,656
  5. Step 5: Solve for x
    x = 8,426,901,861,762,656/99,679,922.40
  6. Step 6: Final answer
    x = 84,539,610.98

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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.