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Finding the Fourth Proportional to 1,355.40, 2,031.68 and 862.18

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Solution

The fourth proportional to 1,355.40, 2,031.68 and 862.18 is: 1,292.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.40 : 2,031.68 = 862.18 : x
  2. Step 2: Convert to fraction form
    1,355.40/2,031.68 = 862.18/x
  3. Step 3: Cross multiply
    1,355.40x = 2,031.68 × 862.18
  4. Step 4: Simplify right side
    1,355.40x = 1,751,670.94
  5. Step 5: Solve for x
    x = 1,751,670.94/1,355.40
  6. Step 6: Final answer
    x = 1,292.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.