Home / 129,130.55-178,148.91-74,672.65

Finding the Fourth Proportional to 129,130.55, 178,148.91 and 74,672.65

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Solution

The fourth proportional to 129,130.55, 178,148.91 and 74,672.65 is: 103,018.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,130.55 : 178,148.91 = 74,672.65 : x
  2. Step 2: Convert to fraction form
    129,130.55/178,148.91 = 74,672.65/x
  3. Step 3: Cross multiply
    129,130.55x = 178,148.91 × 74,672.65
  4. Step 4: Simplify right side
    129,130.55x = 13,302,850,758.94
  5. Step 5: Solve for x
    x = 13,302,850,758.94/129,130.55
  6. Step 6: Final answer
    x = 103,018.62

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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.