Home / 129,641.11-178,916.48-78,666.75

Finding the Fourth Proportional to 129,641.11, 178,916.48 and 78,666.75

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Solution

The fourth proportional to 129,641.11, 178,916.48 and 78,666.75 is: 108,567.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,641.11 : 178,916.48 = 78,666.75 : x
  2. Step 2: Convert to fraction form
    129,641.11/178,916.48 = 78,666.75/x
  3. Step 3: Cross multiply
    129,641.11x = 178,916.48 × 78,666.75
  4. Step 4: Simplify right side
    129,641.11x = 14,074,777,864.57
  5. Step 5: Solve for x
    x = 14,074,777,864.57/129,641.11
  6. Step 6: Final answer
    x = 108,567.24

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1.5x scale

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.