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Finding the Fourth Proportional to 391,145.70, 548,391.30 and 391,145.70

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Solution

The fourth proportional to 391,145.70, 548,391.30 and 391,145.70 is: 548,391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,145.70 : 548,391.30 = 391,145.70 : x
  2. Step 2: Convert to fraction form
    391,145.70/548,391.30 = 391,145.70/x
  3. Step 3: Cross multiply
    391,145.70x = 548,391.30 × 391,145.70
  4. Step 4: Simplify right side
    391,145.70x = 214,500,898,912.41
  5. Step 5: Solve for x
    x = 214,500,898,912.41/391,145.70
  6. Step 6: Final answer
    x = 548,391.30

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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.