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Finding the Fourth Proportional to 77,281.30, 115,921.95 and 68,970.70

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Solution

The fourth proportional to 77,281.30, 115,921.95 and 68,970.70 is: 103,456.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,281.30 : 115,921.95 = 68,970.70 : x
  2. Step 2: Convert to fraction form
    77,281.30/115,921.95 = 68,970.70/x
  3. Step 3: Cross multiply
    77,281.30x = 115,921.95 × 68,970.70
  4. Step 4: Simplify right side
    77,281.30x = 7,995,218,036.87
  5. Step 5: Solve for x
    x = 7,995,218,036.87/77,281.30
  6. Step 6: Final answer
    x = 103,456.05

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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.