Home / 129,426.18-178,663.24-87,009.31

Finding the Fourth Proportional to 129,426.18, 178,663.24 and 87,009.31

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Solution

The fourth proportional to 129,426.18, 178,663.24 and 87,009.31 is: 120,109.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,426.18 : 178,663.24 = 87,009.31 : x
  2. Step 2: Convert to fraction form
    129,426.18/178,663.24 = 87,009.31/x
  3. Step 3: Cross multiply
    129,426.18x = 178,663.24 × 87,009.31
  4. Step 4: Simplify right side
    129,426.18x = 15,545,365,566.86
  5. Step 5: Solve for x
    x = 15,545,365,566.86/129,426.18
  6. Step 6: Final answer
    x = 120,109.90

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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.