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Finding the Fourth Proportional to 715.73, 987.78 and 453.80

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Solution

The fourth proportional to 715.73, 987.78 and 453.80 is: 626.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.73 : 987.78 = 453.80 : x
  2. Step 2: Convert to fraction form
    715.73/987.78 = 453.80/x
  3. Step 3: Cross multiply
    715.73x = 987.78 × 453.80
  4. Step 4: Simplify right side
    715.73x = 448,254.56
  5. Step 5: Solve for x
    x = 448,254.56/715.73
  6. Step 6: Final answer
    x = 626.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.