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Finding the Fourth Proportional to 77,460.40, 115,931.40 and 68,129.20

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Solution

The fourth proportional to 77,460.40, 115,931.40 and 68,129.20 is: 101,965.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,460.40 : 115,931.40 = 68,129.20 : x
  2. Step 2: Convert to fraction form
    77,460.40/115,931.40 = 68,129.20/x
  3. Step 3: Cross multiply
    77,460.40x = 115,931.40 × 68,129.20
  4. Step 4: Simplify right side
    77,460.40x = 7,898,313,536.88
  5. Step 5: Solve for x
    x = 7,898,313,536.88/77,460.40
  6. Step 6: Final answer
    x = 101,965.82

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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.