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Finding the Fourth Proportional to 1,535.12, 2,118.52 and 872

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Solution

The fourth proportional to 1,535.12, 2,118.52 and 872 is: 1,203.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535.12 : 2,118.52 = 872 : x
  2. Step 2: Convert to fraction form
    1,535.12/2,118.52 = 872/x
  3. Step 3: Cross multiply
    1,535.12x = 2,118.52 × 872
  4. Step 4: Simplify right side
    1,535.12x = 1,847,349.44
  5. Step 5: Solve for x
    x = 1,847,349.44/1,535.12
  6. Step 6: Final answer
    x = 1,203.39

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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.