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Finding the Fourth Proportional to 261,879.17, 392,756.47 and 72,335.34

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Solution

The fourth proportional to 261,879.17, 392,756.47 and 72,335.34 is: 108,485.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,879.17 : 392,756.47 = 72,335.34 : x
  2. Step 2: Convert to fraction form
    261,879.17/392,756.47 = 72,335.34/x
  3. Step 3: Cross multiply
    261,879.17x = 392,756.47 × 72,335.34
  4. Step 4: Simplify right side
    261,879.17x = 28,410,171,140.97
  5. Step 5: Solve for x
    x = 28,410,171,140.97/261,879.17
  6. Step 6: Final answer
    x = 108,485.80

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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.