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Finding the Fourth Proportional to 1,560.90, 2,154 and 862.26

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Solution

The fourth proportional to 1,560.90, 2,154 and 862.26 is: 1,189.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,560.90 : 2,154 = 862.26 : x
  2. Step 2: Convert to fraction form
    1,560.90/2,154 = 862.26/x
  3. Step 3: Cross multiply
    1,560.90x = 2,154 × 862.26
  4. Step 4: Simplify right side
    1,560.90x = 1,857,308.04
  5. Step 5: Solve for x
    x = 1,857,308.04/1,560.90
  6. Step 6: Final answer
    x = 1,189.90

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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.