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Finding the Fourth Proportional to 990.92, 1,366.08 and 641

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Solution

The fourth proportional to 990.92, 1,366.08 and 641 is: 883.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.92 : 1,366.08 = 641 : x
  2. Step 2: Convert to fraction form
    990.92/1,366.08 = 641/x
  3. Step 3: Cross multiply
    990.92x = 1,366.08 × 641
  4. Step 4: Simplify right side
    990.92x = 875,657.28
  5. Step 5: Solve for x
    x = 875,657.28/990.92
  6. Step 6: Final answer
    x = 883.68

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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.