Home / 129,051.08-178,109.78-78,779.24

Finding the Fourth Proportional to 129,051.08, 178,109.78 and 78,779.24

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Solution

The fourth proportional to 129,051.08, 178,109.78 and 78,779.24 is: 108,727.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,051.08 : 178,109.78 = 78,779.24 : x
  2. Step 2: Convert to fraction form
    129,051.08/178,109.78 = 78,779.24/x
  3. Step 3: Cross multiply
    129,051.08x = 178,109.78 × 78,779.24
  4. Step 4: Simplify right side
    129,051.08x = 14,031,353,104.97
  5. Step 5: Solve for x
    x = 14,031,353,104.97/129,051.08
  6. Step 6: Final answer
    x = 108,727.13

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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.