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Finding the Fourth Proportional to 261,812.06, 392,726.62 and 72,286.64

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Solution

The fourth proportional to 261,812.06, 392,726.62 and 72,286.64 is: 108,432.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,812.06 : 392,726.62 = 72,286.64 : x
  2. Step 2: Convert to fraction form
    261,812.06/392,726.62 = 72,286.64/x
  3. Step 3: Cross multiply
    261,812.06x = 392,726.62 × 72,286.64
  4. Step 4: Simplify right side
    261,812.06x = 28,388,887,798.36
  5. Step 5: Solve for x
    x = 28,388,887,798.36/261,812.06
  6. Step 6: Final answer
    x = 108,432.32

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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.