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Finding the Fourth Proportional to 1,561.39, 2,342.40 and 521.72

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Solution

The fourth proportional to 1,561.39, 2,342.40 and 521.72 is: 782.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.39 : 2,342.40 = 521.72 : x
  2. Step 2: Convert to fraction form
    1,561.39/2,342.40 = 521.72/x
  3. Step 3: Cross multiply
    1,561.39x = 2,342.40 × 521.72
  4. Step 4: Simplify right side
    1,561.39x = 1,222,065.22
  5. Step 5: Solve for x
    x = 1,222,065.22/1,561.39
  6. Step 6: Final answer
    x = 782.68

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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.