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Finding the Fourth Proportional to 990.02, 1,366.35 and 640.46

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Solution

The fourth proportional to 990.02, 1,366.35 and 640.46 is: 883.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.02 : 1,366.35 = 640.46 : x
  2. Step 2: Convert to fraction form
    990.02/1,366.35 = 640.46/x
  3. Step 3: Cross multiply
    990.02x = 1,366.35 × 640.46
  4. Step 4: Simplify right side
    990.02x = 875,092.52
  5. Step 5: Solve for x
    x = 875,092.52/990.02
  6. Step 6: Final answer
    x = 883.91

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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.