Home / 129,368.12-178,513.56-72,778.28

Finding the Fourth Proportional to 129,368.12, 178,513.56 and 72,778.28

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Solution

The fourth proportional to 129,368.12, 178,513.56 and 72,778.28 is: 100,425.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,368.12 : 178,513.56 = 72,778.28 : x
  2. Step 2: Convert to fraction form
    129,368.12/178,513.56 = 72,778.28/x
  3. Step 3: Cross multiply
    129,368.12x = 178,513.56 × 72,778.28
  4. Step 4: Simplify right side
    129,368.12x = 12,991,909,853.48
  5. Step 5: Solve for x
    x = 12,991,909,853.48/129,368.12
  6. Step 6: Final answer
    x = 100,425.90

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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.