Home / 129,371.10-178,524.63-72,779.10

Finding the Fourth Proportional to 129,371.10, 178,524.63 and 72,779.10

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Solution

The fourth proportional to 129,371.10, 178,524.63 and 72,779.10 is: 100,430.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,371.10 : 178,524.63 = 72,779.10 : x
  2. Step 2: Convert to fraction form
    129,371.10/178,524.63 = 72,779.10/x
  3. Step 3: Cross multiply
    129,371.10x = 178,524.63 × 72,779.10
  4. Step 4: Simplify right side
    129,371.10x = 12,992,861,899.23
  5. Step 5: Solve for x
    x = 12,992,861,899.23/129,371.10
  6. Step 6: Final answer
    x = 100,430.95

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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.