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Finding the Fourth Proportional to 391,645.80, 540,218.18 and 269,079.72

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Solution

The fourth proportional to 391,645.80, 540,218.18 and 269,079.72 is: 371,156.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,645.80 : 540,218.18 = 269,079.72 : x
  2. Step 2: Convert to fraction form
    391,645.80/540,218.18 = 269,079.72/x
  3. Step 3: Cross multiply
    391,645.80x = 540,218.18 × 269,079.72
  4. Step 4: Simplify right side
    391,645.80x = 145,361,756,613.31
  5. Step 5: Solve for x
    x = 145,361,756,613.31/391,645.80
  6. Step 6: Final answer
    x = 371,156.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.