Home / 129,122.64-178,189.10-71,760.16

Finding the Fourth Proportional to 129,122.64, 178,189.10 and 71,760.16

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Solution

The fourth proportional to 129,122.64, 178,189.10 and 71,760.16 is: 99,028.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,122.64 : 178,189.10 = 71,760.16 : x
  2. Step 2: Convert to fraction form
    129,122.64/178,189.10 = 71,760.16/x
  3. Step 3: Cross multiply
    129,122.64x = 178,189.10 × 71,760.16
  4. Step 4: Simplify right side
    129,122.64x = 12,786,878,459.29
  5. Step 5: Solve for x
    x = 12,786,878,459.29/129,122.64
  6. Step 6: Final answer
    x = 99,028.94

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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.