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Finding the Fourth Proportional to 1,561.65, 2,342.76 and 521.55

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Solution

The fourth proportional to 1,561.65, 2,342.76 and 521.55 is: 782.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.65 : 2,342.76 = 521.55 : x
  2. Step 2: Convert to fraction form
    1,561.65/2,342.76 = 521.55/x
  3. Step 3: Cross multiply
    1,561.65x = 2,342.76 × 521.55
  4. Step 4: Simplify right side
    1,561.65x = 1,221,872.33
  5. Step 5: Solve for x
    x = 1,221,872.33/1,561.65
  6. Step 6: Final answer
    x = 782.42

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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.