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Finding the Fourth Proportional to 261,379.64, 392,101.86 and 74,405.72

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Solution

The fourth proportional to 261,379.64, 392,101.86 and 74,405.72 is: 111,617.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,379.64 : 392,101.86 = 74,405.72 : x
  2. Step 2: Convert to fraction form
    261,379.64/392,101.86 = 74,405.72/x
  3. Step 3: Cross multiply
    261,379.64x = 392,101.86 × 74,405.72
  4. Step 4: Simplify right side
    261,379.64x = 29,174,621,206.64
  5. Step 5: Solve for x
    x = 29,174,621,206.64/261,379.64
  6. Step 6: Final answer
    x = 111,617.80

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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.