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Finding the Fourth Proportional to 715.44, 987.75 and 453.90

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Solution

The fourth proportional to 715.44, 987.75 and 453.90 is: 626.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.44 : 987.75 = 453.90 : x
  2. Step 2: Convert to fraction form
    715.44/987.75 = 453.90/x
  3. Step 3: Cross multiply
    715.44x = 987.75 × 453.90
  4. Step 4: Simplify right side
    715.44x = 448,339.73
  5. Step 5: Solve for x
    x = 448,339.73/715.44
  6. Step 6: Final answer
    x = 626.66

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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.