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Finding the Fourth Proportional to 631.35, 871.26 and 355.35

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Solution

The fourth proportional to 631.35, 871.26 and 355.35 is: 490.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.35 : 871.26 = 355.35 : x
  2. Step 2: Convert to fraction form
    631.35/871.26 = 355.35/x
  3. Step 3: Cross multiply
    631.35x = 871.26 × 355.35
  4. Step 4: Simplify right side
    631.35x = 309,596.11
  5. Step 5: Solve for x
    x = 309,596.11/631.35
  6. Step 6: Final answer
    x = 490.38

Related Problems

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Double scale
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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.