Home / 1,020.24-1,538.76-987.40

Finding the Fourth Proportional to 1,020.24, 1,538.76 and 987.40

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Solution

The fourth proportional to 1,020.24, 1,538.76 and 987.40 is: 1,489.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.24 : 1,538.76 = 987.40 : x
  2. Step 2: Convert to fraction form
    1,020.24/1,538.76 = 987.40/x
  3. Step 3: Cross multiply
    1,020.24x = 1,538.76 × 987.40
  4. Step 4: Simplify right side
    1,020.24x = 1,519,371.62
  5. Step 5: Solve for x
    x = 1,519,371.62/1,020.24
  6. Step 6: Final answer
    x = 1,489.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.