Home / 1,587.25-2,189.28-989.24

Finding the Fourth Proportional to 1,587.25, 2,189.28 and 989.24

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Solution

The fourth proportional to 1,587.25, 2,189.28 and 989.24 is: 1,364.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.25 : 2,189.28 = 989.24 : x
  2. Step 2: Convert to fraction form
    1,587.25/2,189.28 = 989.24/x
  3. Step 3: Cross multiply
    1,587.25x = 2,189.28 × 989.24
  4. Step 4: Simplify right side
    1,587.25x = 2,165,716.70
  5. Step 5: Solve for x
    x = 2,165,716.70/1,587.25
  6. Step 6: Final answer
    x = 1,364.45

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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.