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Finding the Fourth Proportional to 124,978.75, 172,470.69 and 68,390.14

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Solution

The fourth proportional to 124,978.75, 172,470.69 and 68,390.14 is: 94,378.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,978.75 : 172,470.69 = 68,390.14 : x
  2. Step 2: Convert to fraction form
    124,978.75/172,470.69 = 68,390.14/x
  3. Step 3: Cross multiply
    124,978.75x = 172,470.69 × 68,390.14
  4. Step 4: Simplify right side
    124,978.75x = 11,795,294,635.00
  5. Step 5: Solve for x
    x = 11,795,294,635.00/124,978.75
  6. Step 6: Final answer
    x = 94,378.40

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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.