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Finding the Fourth Proportional to 261,672.12, 392,466.06 and 74,639.88

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Solution

The fourth proportional to 261,672.12, 392,466.06 and 74,639.88 is: 111,947.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,672.12 : 392,466.06 = 74,639.88 : x
  2. Step 2: Convert to fraction form
    261,672.12/392,466.06 = 74,639.88/x
  3. Step 3: Cross multiply
    261,672.12x = 392,466.06 × 74,639.88
  4. Step 4: Simplify right side
    261,672.12x = 29,293,619,622.47
  5. Step 5: Solve for x
    x = 29,293,619,622.47/261,672.12
  6. Step 6: Final answer
    x = 111,947.81

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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.