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Finding the Fourth Proportional to 261,435.60, 392,153.40 and 84,069.90

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Solution

The fourth proportional to 261,435.60, 392,153.40 and 84,069.90 is: 126,104.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,435.60 : 392,153.40 = 84,069.90 : x
  2. Step 2: Convert to fraction form
    261,435.60/392,153.40 = 84,069.90/x
  3. Step 3: Cross multiply
    261,435.60x = 392,153.40 × 84,069.90
  4. Step 4: Simplify right side
    261,435.60x = 32,968,297,122.66
  5. Step 5: Solve for x
    x = 32,968,297,122.66/261,435.60
  6. Step 6: Final answer
    x = 126,104.85

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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.