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Finding the Fourth Proportional to 1,019.93, 1,521.28 and 989.18

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Solution

The fourth proportional to 1,019.93, 1,521.28 and 989.18 is: 1,475.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.93 : 1,521.28 = 989.18 : x
  2. Step 2: Convert to fraction form
    1,019.93/1,521.28 = 989.18/x
  3. Step 3: Cross multiply
    1,019.93x = 1,521.28 × 989.18
  4. Step 4: Simplify right side
    1,019.93x = 1,504,819.75
  5. Step 5: Solve for x
    x = 1,504,819.75/1,019.93
  6. Step 6: Final answer
    x = 1,475.41

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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.