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Finding the Fourth Proportional to 402.44, 556.08 and 315.77

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Solution

The fourth proportional to 402.44, 556.08 and 315.77 is: 436.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.44 : 556.08 = 315.77 : x
  2. Step 2: Convert to fraction form
    402.44/556.08 = 315.77/x
  3. Step 3: Cross multiply
    402.44x = 556.08 × 315.77
  4. Step 4: Simplify right side
    402.44x = 175,593.38
  5. Step 5: Solve for x
    x = 175,593.38/402.44
  6. Step 6: Final answer
    x = 436.32

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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.