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Finding the Fourth Proportional to 391,644.80, 540,216.80 and 269,078.72

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Solution

The fourth proportional to 391,644.80, 540,216.80 and 269,078.72 is: 371,154.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,644.80 : 540,216.80 = 269,078.72 : x
  2. Step 2: Convert to fraction form
    391,644.80/540,216.80 = 269,078.72/x
  3. Step 3: Cross multiply
    391,644.80x = 540,216.80 × 269,078.72
  4. Step 4: Simplify right side
    391,644.80x = 145,360,845,066.50
  5. Step 5: Solve for x
    x = 145,360,845,066.50/391,644.80
  6. Step 6: Final answer
    x = 371,154.79

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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.