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Finding the Fourth Proportional to 678.08, 936.20 and 631.57

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Solution

The fourth proportional to 678.08, 936.20 and 631.57 is: 871.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.08 : 936.20 = 631.57 : x
  2. Step 2: Convert to fraction form
    678.08/936.20 = 631.57/x
  3. Step 3: Cross multiply
    678.08x = 936.20 × 631.57
  4. Step 4: Simplify right side
    678.08x = 591,275.83
  5. Step 5: Solve for x
    x = 591,275.83/678.08
  6. Step 6: Final answer
    x = 871.99

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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.