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Finding the Fourth Proportional to 403.79, 557.03 and 315.11

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Solution

The fourth proportional to 403.79, 557.03 and 315.11 is: 434.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.79 : 557.03 = 315.11 : x
  2. Step 2: Convert to fraction form
    403.79/557.03 = 315.11/x
  3. Step 3: Cross multiply
    403.79x = 557.03 × 315.11
  4. Step 4: Simplify right side
    403.79x = 175,521.36
  5. Step 5: Solve for x
    x = 175,521.36/403.79
  6. Step 6: Final answer
    x = 434.69

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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.