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Finding the Fourth Proportional to 261,343.40, 391,520.46 and 154,407.56

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Solution

The fourth proportional to 261,343.40, 391,520.46 and 154,407.56 is: 231,319.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,343.40 : 391,520.46 = 154,407.56 : x
  2. Step 2: Convert to fraction form
    261,343.40/391,520.46 = 154,407.56/x
  3. Step 3: Cross multiply
    261,343.40x = 391,520.46 × 154,407.56
  4. Step 4: Simplify right side
    261,343.40x = 60,453,718,918.68
  5. Step 5: Solve for x
    x = 60,453,718,918.68/261,343.40
  6. Step 6: Final answer
    x = 231,319.10

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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.