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Finding the Fourth Proportional to 1,521.01, 2,279.73 and 643.33

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Solution

The fourth proportional to 1,521.01, 2,279.73 and 643.33 is: 964.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.01 : 2,279.73 = 643.33 : x
  2. Step 2: Convert to fraction form
    1,521.01/2,279.73 = 643.33/x
  3. Step 3: Cross multiply
    1,521.01x = 2,279.73 × 643.33
  4. Step 4: Simplify right side
    1,521.01x = 1,466,618.70
  5. Step 5: Solve for x
    x = 1,466,618.70/1,521.01
  6. Step 6: Final answer
    x = 964.24

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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.