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Finding the Fourth Proportional to 78,828.81, 118,144.81 and 39,397.20

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Solution

The fourth proportional to 78,828.81, 118,144.81 and 39,397.20 is: 59,046.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,828.81 : 118,144.81 = 39,397.20 : x
  2. Step 2: Convert to fraction form
    78,828.81/118,144.81 = 39,397.20/x
  3. Step 3: Cross multiply
    78,828.81x = 118,144.81 × 39,397.20
  4. Step 4: Simplify right side
    78,828.81x = 4,654,574,905.40
  5. Step 5: Solve for x
    x = 4,654,574,905.40/78,828.81
  6. Step 6: Final answer
    x = 59,046.62

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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.