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Finding the Fourth Proportional to 1,488.72, 2,233 and 611.20

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Solution

The fourth proportional to 1,488.72, 2,233 and 611.20 is: 916.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,488.72 : 2,233 = 611.20 : x
  2. Step 2: Convert to fraction form
    1,488.72/2,233 = 611.20/x
  3. Step 3: Cross multiply
    1,488.72x = 2,233 × 611.20
  4. Step 4: Simplify right side
    1,488.72x = 1,364,809.60
  5. Step 5: Solve for x
    x = 1,364,809.60/1,488.72
  6. Step 6: Final answer
    x = 916.77

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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.