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Finding the Fourth Proportional to 391,515.78, 540,282.72 and 228,161.88

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Solution

The fourth proportional to 391,515.78, 540,282.72 and 228,161.88 is: 314,858.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,515.78 : 540,282.72 = 228,161.88 : x
  2. Step 2: Convert to fraction form
    391,515.78/540,282.72 = 228,161.88/x
  3. Step 3: Cross multiply
    391,515.78x = 540,282.72 × 228,161.88
  4. Step 4: Simplify right side
    391,515.78x = 123,271,921,126.71
  5. Step 5: Solve for x
    x = 123,271,921,126.71/391,515.78
  6. Step 6: Final answer
    x = 314,858.12

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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.