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Finding the Fourth Proportional to 129,036.65, 178,064.55 and 71,679.68

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Solution

The fourth proportional to 129,036.65, 178,064.55 and 71,679.68 is: 98,914.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,036.65 : 178,064.55 = 71,679.68 : x
  2. Step 2: Convert to fraction form
    129,036.65/178,064.55 = 71,679.68/x
  3. Step 3: Cross multiply
    129,036.65x = 178,064.55 × 71,679.68
  4. Step 4: Simplify right side
    129,036.65x = 12,763,610,943.98
  5. Step 5: Solve for x
    x = 12,763,610,943.98/129,036.65
  6. Step 6: Final answer
    x = 98,914.62

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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.