Home / 129,141.91-178,214.66-71,779.76

Finding the Fourth Proportional to 129,141.91, 178,214.66 and 71,779.76

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Solution

The fourth proportional to 129,141.91, 178,214.66 and 71,779.76 is: 99,055.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,141.91 : 178,214.66 = 71,779.76 : x
  2. Step 2: Convert to fraction form
    129,141.91/178,214.66 = 71,779.76/x
  3. Step 3: Cross multiply
    129,141.91x = 178,214.66 × 71,779.76
  4. Step 4: Simplify right side
    129,141.91x = 12,792,205,210.79
  5. Step 5: Solve for x
    x = 12,792,205,210.79/129,141.91
  6. Step 6: Final answer
    x = 99,055.41

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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.