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Finding the Fourth Proportional to 78,859.89, 118,244.39 and 53,930.15

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Solution

The fourth proportional to 78,859.89, 118,244.39 and 53,930.15 is: 80,864.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,859.89 : 118,244.39 = 53,930.15 : x
  2. Step 2: Convert to fraction form
    78,859.89/118,244.39 = 53,930.15/x
  3. Step 3: Cross multiply
    78,859.89x = 118,244.39 × 53,930.15
  4. Step 4: Simplify right side
    78,859.89x = 6,376,937,271.90
  5. Step 5: Solve for x
    x = 6,376,937,271.90/78,859.89
  6. Step 6: Final answer
    x = 80,864.14

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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.