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Finding the Fourth Proportional to 261,988.20, 392,982.30 and 72,448.20

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Solution

The fourth proportional to 261,988.20, 392,982.30 and 72,448.20 is: 108,672.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,988.20 : 392,982.30 = 72,448.20 : x
  2. Step 2: Convert to fraction form
    261,988.20/392,982.30 = 72,448.20/x
  3. Step 3: Cross multiply
    261,988.20x = 392,982.30 × 72,448.20
  4. Step 4: Simplify right side
    261,988.20x = 28,470,860,266.86
  5. Step 5: Solve for x
    x = 28,470,860,266.86/261,988.20
  6. Step 6: Final answer
    x = 108,672.30

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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.