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Finding the Fourth Proportional to 100,712.65, 138,972.55 and 58,263.25

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Solution

The fourth proportional to 100,712.65, 138,972.55 and 58,263.25 is: 80,396.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,712.65 : 138,972.55 = 58,263.25 : x
  2. Step 2: Convert to fraction form
    100,712.65/138,972.55 = 58,263.25/x
  3. Step 3: Cross multiply
    100,712.65x = 138,972.55 × 58,263.25
  4. Step 4: Simplify right side
    100,712.65x = 8,096,992,423.79
  5. Step 5: Solve for x
    x = 8,096,992,423.79/100,712.65
  6. Step 6: Final answer
    x = 80,396.98

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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.