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Finding the Fourth Proportional to 1,561.92, 2,343.20 and 521.80

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Solution

The fourth proportional to 1,561.92, 2,343.20 and 521.80 is: 782.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.92 : 2,343.20 = 521.80 : x
  2. Step 2: Convert to fraction form
    1,561.92/2,343.20 = 521.80/x
  3. Step 3: Cross multiply
    1,561.92x = 2,343.20 × 521.80
  4. Step 4: Simplify right side
    1,561.92x = 1,222,681.76
  5. Step 5: Solve for x
    x = 1,222,681.76/1,561.92
  6. Step 6: Final answer
    x = 782.81

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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.