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Finding the Fourth Proportional to 974.79, 1,344.98 and 555.05

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Solution

The fourth proportional to 974.79, 1,344.98 and 555.05 is: 765.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.79 : 1,344.98 = 555.05 : x
  2. Step 2: Convert to fraction form
    974.79/1,344.98 = 555.05/x
  3. Step 3: Cross multiply
    974.79x = 1,344.98 × 555.05
  4. Step 4: Simplify right side
    974.79x = 746,521.65
  5. Step 5: Solve for x
    x = 746,521.65/974.79
  6. Step 6: Final answer
    x = 765.83

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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.