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Finding the Fourth Proportional to 391,147.20, 548,393.40 and 391,147.20

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Solution

The fourth proportional to 391,147.20, 548,393.40 and 391,147.20 is: 548,393.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,147.20 : 548,393.40 = 391,147.20 : x
  2. Step 2: Convert to fraction form
    391,147.20/548,393.40 = 391,147.20/x
  3. Step 3: Cross multiply
    391,147.20x = 548,393.40 × 391,147.20
  4. Step 4: Simplify right side
    391,147.20x = 214,502,542,908.48
  5. Step 5: Solve for x
    x = 214,502,542,908.48/391,147.20
  6. Step 6: Final answer
    x = 548,393.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.