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Finding the Fourth Proportional to 976.17, 1,347.15 and 622.10

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Solution

The fourth proportional to 976.17, 1,347.15 and 622.10 is: 858.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.17 : 1,347.15 = 622.10 : x
  2. Step 2: Convert to fraction form
    976.17/1,347.15 = 622.10/x
  3. Step 3: Cross multiply
    976.17x = 1,347.15 × 622.10
  4. Step 4: Simplify right side
    976.17x = 838,067.72
  5. Step 5: Solve for x
    x = 838,067.72/976.17
  6. Step 6: Final answer
    x = 858.52

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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.