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Finding the Fourth Proportional to 78,791.61, 118,013.65 and 65,127.61

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Solution

The fourth proportional to 78,791.61, 118,013.65 and 65,127.61 is: 97,547.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,791.61 : 118,013.65 = 65,127.61 : x
  2. Step 2: Convert to fraction form
    78,791.61/118,013.65 = 65,127.61/x
  3. Step 3: Cross multiply
    78,791.61x = 118,013.65 × 65,127.61
  4. Step 4: Simplify right side
    78,791.61x = 7,685,946,971.88
  5. Step 5: Solve for x
    x = 7,685,946,971.88/78,791.61
  6. Step 6: Final answer
    x = 97,547.78

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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.