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Finding the Fourth Proportional to 78,898.80, 118,421.10 and 39,484.20

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Solution

The fourth proportional to 78,898.80, 118,421.10 and 39,484.20 is: 59,262.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,898.80 : 118,421.10 = 39,484.20 : x
  2. Step 2: Convert to fraction form
    78,898.80/118,421.10 = 39,484.20/x
  3. Step 3: Cross multiply
    78,898.80x = 118,421.10 × 39,484.20
  4. Step 4: Simplify right side
    78,898.80x = 4,675,762,396.62
  5. Step 5: Solve for x
    x = 4,675,762,396.62/78,898.80
  6. Step 6: Final answer
    x = 59,262.78

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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.