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Finding the Fourth Proportional to 990.06, 1,366.11 and 616.92

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Solution

The fourth proportional to 990.06, 1,366.11 and 616.92 is: 851.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.06 : 1,366.11 = 616.92 : x
  2. Step 2: Convert to fraction form
    990.06/1,366.11 = 616.92/x
  3. Step 3: Cross multiply
    990.06x = 1,366.11 × 616.92
  4. Step 4: Simplify right side
    990.06x = 842,780.58
  5. Step 5: Solve for x
    x = 842,780.58/990.06
  6. Step 6: Final answer
    x = 851.24

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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.