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Finding the Fourth Proportional to 974.24, 1,345.55 and 644.13

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Solution

The fourth proportional to 974.24, 1,345.55 and 644.13 is: 889.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.24 : 1,345.55 = 644.13 : x
  2. Step 2: Convert to fraction form
    974.24/1,345.55 = 644.13/x
  3. Step 3: Cross multiply
    974.24x = 1,345.55 × 644.13
  4. Step 4: Simplify right side
    974.24x = 866,705.90
  5. Step 5: Solve for x
    x = 866,705.90/974.24
  6. Step 6: Final answer
    x = 889.62

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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.