Home / 87,128.20-130,400.70-76,630.60

Finding the Fourth Proportional to 87,128.20, 130,400.70 and 76,630.60

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Solution

The fourth proportional to 87,128.20, 130,400.70 and 76,630.60 is: 114,689.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,128.20 : 130,400.70 = 76,630.60 : x
  2. Step 2: Convert to fraction form
    87,128.20/130,400.70 = 76,630.60/x
  3. Step 3: Cross multiply
    87,128.20x = 130,400.70 × 76,630.60
  4. Step 4: Simplify right side
    87,128.20x = 9,992,683,881.42
  5. Step 5: Solve for x
    x = 9,992,683,881.42/87,128.20
  6. Step 6: Final answer
    x = 114,689.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.