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Finding the Fourth Proportional to 974.48, 1,344.78 and 554.81

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Solution

The fourth proportional to 974.48, 1,344.78 and 554.81 is: 765.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.48 : 1,344.78 = 554.81 : x
  2. Step 2: Convert to fraction form
    974.48/1,344.78 = 554.81/x
  3. Step 3: Cross multiply
    974.48x = 1,344.78 × 554.81
  4. Step 4: Simplify right side
    974.48x = 746,090.67
  5. Step 5: Solve for x
    x = 746,090.67/974.48
  6. Step 6: Final answer
    x = 765.63

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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.