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Finding the Fourth Proportional to 974.48, 1,345.20 and 660.65

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Solution

The fourth proportional to 974.48, 1,345.20 and 660.65 is: 911.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.48 : 1,345.20 = 660.65 : x
  2. Step 2: Convert to fraction form
    974.48/1,345.20 = 660.65/x
  3. Step 3: Cross multiply
    974.48x = 1,345.20 × 660.65
  4. Step 4: Simplify right side
    974.48x = 888,703.37
  5. Step 5: Solve for x
    x = 888,703.37/974.48
  6. Step 6: Final answer
    x = 911.98

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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.