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Finding the Fourth Proportional to 77,172.59, 115,679.95 and 52,215.28

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Solution

The fourth proportional to 77,172.59, 115,679.95 and 52,215.28 is: 78,269.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,172.59 : 115,679.95 = 52,215.28 : x
  2. Step 2: Convert to fraction form
    77,172.59/115,679.95 = 52,215.28/x
  3. Step 3: Cross multiply
    77,172.59x = 115,679.95 × 52,215.28
  4. Step 4: Simplify right side
    77,172.59x = 6,040,260,979.64
  5. Step 5: Solve for x
    x = 6,040,260,979.64/77,172.59
  6. Step 6: Final answer
    x = 78,269.51

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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.