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Finding the Fourth Proportional to 317,699.91, 438,430.91 and 172,505.61

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Solution

The fourth proportional to 317,699.91, 438,430.91 and 172,505.61 is: 238,060.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,699.91 : 438,430.91 = 172,505.61 : x
  2. Step 2: Convert to fraction form
    317,699.91/438,430.91 = 172,505.61/x
  3. Step 3: Cross multiply
    317,699.91x = 438,430.91 × 172,505.61
  4. Step 4: Simplify right side
    317,699.91x = 75,631,791,572.41
  5. Step 5: Solve for x
    x = 75,631,791,572.41/317,699.91
  6. Step 6: Final answer
    x = 238,060.48

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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.