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Finding the Fourth Proportional to 99,490.85, 137,290.43 and 56,471.22

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Solution

The fourth proportional to 99,490.85, 137,290.43 and 56,471.22 is: 77,926.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,490.85 : 137,290.43 = 56,471.22 : x
  2. Step 2: Convert to fraction form
    99,490.85/137,290.43 = 56,471.22/x
  3. Step 3: Cross multiply
    99,490.85x = 137,290.43 × 56,471.22
  4. Step 4: Simplify right side
    99,490.85x = 7,752,958,217.60
  5. Step 5: Solve for x
    x = 7,752,958,217.60/99,490.85
  6. Step 6: Final answer
    x = 77,926.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.