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Finding the Fourth Proportional to 974.97, 1,345.27 and 555.31

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Solution

The fourth proportional to 974.97, 1,345.27 and 555.31 is: 766.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.97 : 1,345.27 = 555.31 : x
  2. Step 2: Convert to fraction form
    974.97/1,345.27 = 555.31/x
  3. Step 3: Cross multiply
    974.97x = 1,345.27 × 555.31
  4. Step 4: Simplify right side
    974.97x = 747,042.75
  5. Step 5: Solve for x
    x = 747,042.75/974.97
  6. Step 6: Final answer
    x = 766.22

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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.