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Finding the Fourth Proportional to 716.31, 1,074.80 and 521.51

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Solution

The fourth proportional to 716.31, 1,074.80 and 521.51 is: 782.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.31 : 1,074.80 = 521.51 : x
  2. Step 2: Convert to fraction form
    716.31/1,074.80 = 521.51/x
  3. Step 3: Cross multiply
    716.31x = 1,074.80 × 521.51
  4. Step 4: Simplify right side
    716.31x = 560,514.88
  5. Step 5: Solve for x
    x = 560,514.88/716.31
  6. Step 6: Final answer
    x = 782.50

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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.