Home / 1,547.10-2,135.19-987.90

Finding the Fourth Proportional to 1,547.10, 2,135.19 and 987.90

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Solution

The fourth proportional to 1,547.10, 2,135.19 and 987.90 is: 1,363.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.10 : 2,135.19 = 987.90 : x
  2. Step 2: Convert to fraction form
    1,547.10/2,135.19 = 987.90/x
  3. Step 3: Cross multiply
    1,547.10x = 2,135.19 × 987.90
  4. Step 4: Simplify right side
    1,547.10x = 2,109,354.20
  5. Step 5: Solve for x
    x = 2,109,354.20/1,547.10
  6. Step 6: Final answer
    x = 1,363.42

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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.