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Finding the Fourth Proportional to 990.92, 1,477.65 and 921.66

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Solution

The fourth proportional to 990.92, 1,477.65 and 921.66 is: 1,374.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.92 : 1,477.65 = 921.66 : x
  2. Step 2: Convert to fraction form
    990.92/1,477.65 = 921.66/x
  3. Step 3: Cross multiply
    990.92x = 1,477.65 × 921.66
  4. Step 4: Simplify right side
    990.92x = 1,361,890.90
  5. Step 5: Solve for x
    x = 1,361,890.90/990.92
  6. Step 6: Final answer
    x = 1,374.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.