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Finding the Fourth Proportional to 115,359.40, 172,877.10 and 91,707.40

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Solution

The fourth proportional to 115,359.40, 172,877.10 and 91,707.40 is: 137,432.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,359.40 : 172,877.10 = 91,707.40 : x
  2. Step 2: Convert to fraction form
    115,359.40/172,877.10 = 91,707.40/x
  3. Step 3: Cross multiply
    115,359.40x = 172,877.10 × 91,707.40
  4. Step 4: Simplify right side
    115,359.40x = 15,854,109,360.54
  5. Step 5: Solve for x
    x = 15,854,109,360.54/115,359.40
  6. Step 6: Final answer
    x = 137,432.31

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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.