Home / 129,309.03-178,445.30-72,720.81

Finding the Fourth Proportional to 129,309.03, 178,445.30 and 72,720.81

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Solution

The fourth proportional to 129,309.03, 178,445.30 and 72,720.81 is: 100,354.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,309.03 : 178,445.30 = 72,720.81 : x
  2. Step 2: Convert to fraction form
    129,309.03/178,445.30 = 72,720.81/x
  3. Step 3: Cross multiply
    129,309.03x = 178,445.30 × 72,720.81
  4. Step 4: Simplify right side
    129,309.03x = 12,976,686,393.09
  5. Step 5: Solve for x
    x = 12,976,686,393.09/129,309.03
  6. Step 6: Final answer
    x = 100,354.06

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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.