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Finding the Fourth Proportional to 391,956.02, 540,319.38 and 305,817.38

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Solution

The fourth proportional to 391,956.02, 540,319.38 and 305,817.38 is: 421,575.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,956.02 : 540,319.38 = 305,817.38 : x
  2. Step 2: Convert to fraction form
    391,956.02/540,319.38 = 305,817.38/x
  3. Step 3: Cross multiply
    391,956.02x = 540,319.38 × 305,817.38
  4. Step 4: Simplify right side
    391,956.02x = 165,239,057,154.82
  5. Step 5: Solve for x
    x = 165,239,057,154.82/391,956.02
  6. Step 6: Final answer
    x = 421,575.51

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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.