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Finding the Fourth Proportional to 974.88, 1,345.12 and 660.19

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Solution

The fourth proportional to 974.88, 1,345.12 and 660.19 is: 910.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.88 : 1,345.12 = 660.19 : x
  2. Step 2: Convert to fraction form
    974.88/1,345.12 = 660.19/x
  3. Step 3: Cross multiply
    974.88x = 1,345.12 × 660.19
  4. Step 4: Simplify right side
    974.88x = 888,034.77
  5. Step 5: Solve for x
    x = 888,034.77/974.88
  6. Step 6: Final answer
    x = 910.92

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1.5x scale

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.