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Finding the Fourth Proportional to 261,355.60, 392,163.12 and 103,580.56

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Solution

The fourth proportional to 261,355.60, 392,163.12 and 103,580.56 is: 155,422.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,355.60 : 392,163.12 = 103,580.56 : x
  2. Step 2: Convert to fraction form
    261,355.60/392,163.12 = 103,580.56/x
  3. Step 3: Cross multiply
    261,355.60x = 392,163.12 × 103,580.56
  4. Step 4: Simplify right side
    261,355.60x = 40,620,475,580.95
  5. Step 5: Solve for x
    x = 40,620,475,580.95/261,355.60
  6. Step 6: Final answer
    x = 155,422.25

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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.