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Finding the Fourth Proportional to 976.08, 1,347.10 and 645.18

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Solution

The fourth proportional to 976.08, 1,347.10 and 645.18 is: 890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.08 : 1,347.10 = 645.18 : x
  2. Step 2: Convert to fraction form
    976.08/1,347.10 = 645.18/x
  3. Step 3: Cross multiply
    976.08x = 1,347.10 × 645.18
  4. Step 4: Simplify right side
    976.08x = 869,121.98
  5. Step 5: Solve for x
    x = 869,121.98/976.08
  6. Step 6: Final answer
    x = 890.42

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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.