Home / 129,070.90-178,120.12-71,715.48

Finding the Fourth Proportional to 129,070.90, 178,120.12 and 71,715.48

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Solution

The fourth proportional to 129,070.90, 178,120.12 and 71,715.48 is: 98,968.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,070.90 : 178,120.12 = 71,715.48 : x
  2. Step 2: Convert to fraction form
    129,070.90/178,120.12 = 71,715.48/x
  3. Step 3: Cross multiply
    129,070.90x = 178,120.12 × 71,715.48
  4. Step 4: Simplify right side
    129,070.90x = 12,773,969,903.46
  5. Step 5: Solve for x
    x = 12,773,969,903.46/129,070.90
  6. Step 6: Final answer
    x = 98,968.63

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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.