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Finding the Fourth Proportional to 403.89, 557.76 and 348.11

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Solution

The fourth proportional to 403.89, 557.76 and 348.11 is: 480.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.89 : 557.76 = 348.11 : x
  2. Step 2: Convert to fraction form
    403.89/557.76 = 348.11/x
  3. Step 3: Cross multiply
    403.89x = 557.76 × 348.11
  4. Step 4: Simplify right side
    403.89x = 194,159.04
  5. Step 5: Solve for x
    x = 194,159.04/403.89
  6. Step 6: Final answer
    x = 480.72

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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.