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Finding the Fourth Proportional to 631.76, 871.90 and 383.10

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Solution

The fourth proportional to 631.76, 871.90 and 383.10 is: 528.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.76 : 871.90 = 383.10 : x
  2. Step 2: Convert to fraction form
    631.76/871.90 = 383.10/x
  3. Step 3: Cross multiply
    631.76x = 871.90 × 383.10
  4. Step 4: Simplify right side
    631.76x = 334,024.89
  5. Step 5: Solve for x
    x = 334,024.89/631.76
  6. Step 6: Final answer
    x = 528.72

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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.