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Finding the Fourth Proportional to 1,001.44, 1,494.77 and 990.55

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Solution

The fourth proportional to 1,001.44, 1,494.77 and 990.55 is: 1,478.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.44 : 1,494.77 = 990.55 : x
  2. Step 2: Convert to fraction form
    1,001.44/1,494.77 = 990.55/x
  3. Step 3: Cross multiply
    1,001.44x = 1,494.77 × 990.55
  4. Step 4: Simplify right side
    1,001.44x = 1,480,644.42
  5. Step 5: Solve for x
    x = 1,480,644.42/1,001.44
  6. Step 6: Final answer
    x = 1,478.52

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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.