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Finding the Fourth Proportional to 715.52, 987.72 and 482.96

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Solution

The fourth proportional to 715.52, 987.72 and 482.96 is: 666.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.52 : 987.72 = 482.96 : x
  2. Step 2: Convert to fraction form
    715.52/987.72 = 482.96/x
  3. Step 3: Cross multiply
    715.52x = 987.72 × 482.96
  4. Step 4: Simplify right side
    715.52x = 477,029.25
  5. Step 5: Solve for x
    x = 477,029.25/715.52
  6. Step 6: Final answer
    x = 666.69

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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.