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Finding the Fourth Proportional to 717.92, 990.96 and 485.36

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Solution

The fourth proportional to 717.92, 990.96 and 485.36 is: 669.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.92 : 990.96 = 485.36 : x
  2. Step 2: Convert to fraction form
    717.92/990.96 = 485.36/x
  3. Step 3: Cross multiply
    717.92x = 990.96 × 485.36
  4. Step 4: Simplify right side
    717.92x = 480,972.35
  5. Step 5: Solve for x
    x = 480,972.35/717.92
  6. Step 6: Final answer
    x = 669.95

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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.