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Finding the Fourth Proportional to 261,879.49, 392,841.87 and 72,339.80

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Solution

The fourth proportional to 261,879.49, 392,841.87 and 72,339.80 is: 108,515.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,879.49 : 392,841.87 = 72,339.80 : x
  2. Step 2: Convert to fraction form
    261,879.49/392,841.87 = 72,339.80/x
  3. Step 3: Cross multiply
    261,879.49x = 392,841.87 × 72,339.80
  4. Step 4: Simplify right side
    261,879.49x = 28,418,100,071.94
  5. Step 5: Solve for x
    x = 28,418,100,071.94/261,879.49
  6. Step 6: Final answer
    x = 108,515.94

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1.5x scale

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.