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Finding the Fourth Proportional to 982.32, 1,355.28 and 562.72

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Solution

The fourth proportional to 982.32, 1,355.28 and 562.72 is: 776.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.32 : 1,355.28 = 562.72 : x
  2. Step 2: Convert to fraction form
    982.32/1,355.28 = 562.72/x
  3. Step 3: Cross multiply
    982.32x = 1,355.28 × 562.72
  4. Step 4: Simplify right side
    982.32x = 762,643.16
  5. Step 5: Solve for x
    x = 762,643.16/982.32
  6. Step 6: Final answer
    x = 776.37

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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.