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Finding the Fourth Proportional to 99,840,378.80, 149,508,625.80 and 79,684,986.80

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Solution

The fourth proportional to 99,840,378.80, 149,508,625.80 and 79,684,986.80 is: 119,326,398.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,840,378.80 : 149,508,625.80 = 79,684,986.80 : x
  2. Step 2: Convert to fraction form
    99,840,378.80/149,508,625.80 = 79,684,986.80/x
  3. Step 3: Cross multiply
    99,840,378.80x = 149,508,625.80 × 79,684,986.80
  4. Step 4: Simplify right side
    99,840,378.80x = 11,913,592,873,359,140
  5. Step 5: Solve for x
    x = 11,913,592,873,359,140/99,840,378.80
  6. Step 6: Final answer
    x = 119,326,398.96

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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.