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Finding the Fourth Proportional to 981.24, 1,354.33 and 631.32

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Solution

The fourth proportional to 981.24, 1,354.33 and 631.32 is: 871.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.24 : 1,354.33 = 631.32 : x
  2. Step 2: Convert to fraction form
    981.24/1,354.33 = 631.32/x
  3. Step 3: Cross multiply
    981.24x = 1,354.33 × 631.32
  4. Step 4: Simplify right side
    981.24x = 855,015.62
  5. Step 5: Solve for x
    x = 855,015.62/981.24
  6. Step 6: Final answer
    x = 871.36

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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.