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Finding the Fourth Proportional to 99,813.70, 149,720.55 and 91,648.90

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Solution

The fourth proportional to 99,813.70, 149,720.55 and 91,648.90 is: 137,473.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,813.70 : 149,720.55 = 91,648.90 : x
  2. Step 2: Convert to fraction form
    99,813.70/149,720.55 = 91,648.90/x
  3. Step 3: Cross multiply
    99,813.70x = 149,720.55 × 91,648.90
  4. Step 4: Simplify right side
    99,813.70x = 13,721,723,714.90
  5. Step 5: Solve for x
    x = 13,721,723,714.90/99,813.70
  6. Step 6: Final answer
    x = 137,473.35

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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.