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Finding the Fourth Proportional to 261,409.10, 392,105.55 and 74,420.60

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Solution

The fourth proportional to 261,409.10, 392,105.55 and 74,420.60 is: 111,628.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,409.10 : 392,105.55 = 74,420.60 : x
  2. Step 2: Convert to fraction form
    261,409.10/392,105.55 = 74,420.60/x
  3. Step 3: Cross multiply
    261,409.10x = 392,105.55 × 74,420.60
  4. Step 4: Simplify right side
    261,409.10x = 29,180,730,294.33
  5. Step 5: Solve for x
    x = 29,180,730,294.33/261,409.10
  6. Step 6: Final answer
    x = 111,628.59

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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.