Home / 129,499.60-178,708.80-72,911.38

Finding the Fourth Proportional to 129,499.60, 178,708.80 and 72,911.38

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Solution

The fourth proportional to 129,499.60, 178,708.80 and 72,911.38 is: 100,617.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,499.60 : 178,708.80 = 72,911.38 : x
  2. Step 2: Convert to fraction form
    129,499.60/178,708.80 = 72,911.38/x
  3. Step 3: Cross multiply
    129,499.60x = 178,708.80 × 72,911.38
  4. Step 4: Simplify right side
    129,499.60x = 13,029,905,226.14
  5. Step 5: Solve for x
    x = 13,029,905,226.14/129,499.60
  6. Step 6: Final answer
    x = 100,617.34

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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.