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Finding the Fourth Proportional to 261,990.01, 392,976.69 and 72,461.80

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Solution

The fourth proportional to 261,990.01, 392,976.69 and 72,461.80 is: 108,690.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,990.01 : 392,976.69 = 72,461.80 : x
  2. Step 2: Convert to fraction form
    261,990.01/392,976.69 = 72,461.80/x
  3. Step 3: Cross multiply
    261,990.01x = 392,976.69 × 72,461.80
  4. Step 4: Simplify right side
    261,990.01x = 28,475,798,315.44
  5. Step 5: Solve for x
    x = 28,475,798,315.44/261,990.01
  6. Step 6: Final answer
    x = 108,690.40

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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.