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Finding the Fourth Proportional to 78,760.68, 108,729.90 and 53,401.08

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Solution

The fourth proportional to 78,760.68, 108,729.90 and 53,401.08 is: 73,720.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,760.68 : 108,729.90 = 53,401.08 : x
  2. Step 2: Convert to fraction form
    78,760.68/108,729.90 = 53,401.08/x
  3. Step 3: Cross multiply
    78,760.68x = 108,729.90 × 53,401.08
  4. Step 4: Simplify right side
    78,760.68x = 5,806,294,088.29
  5. Step 5: Solve for x
    x = 5,806,294,088.29/78,760.68
  6. Step 6: Final answer
    x = 73,720.72

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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.