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Finding the Fourth Proportional to 631.50, 871.55 and 382.91

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Solution

The fourth proportional to 631.50, 871.55 and 382.91 is: 528.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.50 : 871.55 = 382.91 : x
  2. Step 2: Convert to fraction form
    631.50/871.55 = 382.91/x
  3. Step 3: Cross multiply
    631.50x = 871.55 × 382.91
  4. Step 4: Simplify right side
    631.50x = 333,725.21
  5. Step 5: Solve for x
    x = 333,725.21/631.50
  6. Step 6: Final answer
    x = 528.46

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1.5x scale

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.