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Finding the Fourth Proportional to 99,720.78, 149,668.64 and 55,397.58

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Solution

The fourth proportional to 99,720.78, 149,668.64 and 55,397.58 is: 83,144.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,720.78 : 149,668.64 = 55,397.58 : x
  2. Step 2: Convert to fraction form
    99,720.78/149,668.64 = 55,397.58/x
  3. Step 3: Cross multiply
    99,720.78x = 149,668.64 × 55,397.58
  4. Step 4: Simplify right side
    99,720.78x = 8,291,280,457.89
  5. Step 5: Solve for x
    x = 8,291,280,457.89/99,720.78
  6. Step 6: Final answer
    x = 83,144.96

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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.