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Finding the Fourth Proportional to 521.16, 719.10 and 311.31

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Solution

The fourth proportional to 521.16, 719.10 and 311.31 is: 429.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.16 : 719.10 = 311.31 : x
  2. Step 2: Convert to fraction form
    521.16/719.10 = 311.31/x
  3. Step 3: Cross multiply
    521.16x = 719.10 × 311.31
  4. Step 4: Simplify right side
    521.16x = 223,863.02
  5. Step 5: Solve for x
    x = 223,863.02/521.16
  6. Step 6: Final answer
    x = 429.55

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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.