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Finding the Fourth Proportional to 1,521.70, 2,282.55 and 871.90

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Solution

The fourth proportional to 1,521.70, 2,282.55 and 871.90 is: 1,307.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.70 : 2,282.55 = 871.90 : x
  2. Step 2: Convert to fraction form
    1,521.70/2,282.55 = 871.90/x
  3. Step 3: Cross multiply
    1,521.70x = 2,282.55 × 871.90
  4. Step 4: Simplify right side
    1,521.70x = 1,990,155.35
  5. Step 5: Solve for x
    x = 1,990,155.35/1,521.70
  6. Step 6: Final answer
    x = 1,307.85

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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.