Home / 1,587.28-2,190.51-998.20

Finding the Fourth Proportional to 1,587.28, 2,190.51 and 998.20

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Solution

The fourth proportional to 1,587.28, 2,190.51 and 998.20 is: 1,377.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.28 : 2,190.51 = 998.20 : x
  2. Step 2: Convert to fraction form
    1,587.28/2,190.51 = 998.20/x
  3. Step 3: Cross multiply
    1,587.28x = 2,190.51 × 998.20
  4. Step 4: Simplify right side
    1,587.28x = 2,186,567.08
  5. Step 5: Solve for x
    x = 2,186,567.08/1,587.28
  6. Step 6: Final answer
    x = 1,377.56

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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.