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Finding the Fourth Proportional to 78,689.76, 108,615.60 and 51,470.16

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Solution

The fourth proportional to 78,689.76, 108,615.60 and 51,470.16 is: 71,044.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,689.76 : 108,615.60 = 51,470.16 : x
  2. Step 2: Convert to fraction form
    78,689.76/108,615.60 = 51,470.16/x
  3. Step 3: Cross multiply
    78,689.76x = 108,615.60 × 51,470.16
  4. Step 4: Simplify right side
    78,689.76x = 5,590,462,310.50
  5. Step 5: Solve for x
    x = 5,590,462,310.50/78,689.76
  6. Step 6: Final answer
    x = 71,044.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.