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Finding the Fourth Proportional to 715.92, 987.68 and 483.68

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Solution

The fourth proportional to 715.92, 987.68 and 483.68 is: 667.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.92 : 987.68 = 483.68 : x
  2. Step 2: Convert to fraction form
    715.92/987.68 = 483.68/x
  3. Step 3: Cross multiply
    715.92x = 987.68 × 483.68
  4. Step 4: Simplify right side
    715.92x = 477,721.06
  5. Step 5: Solve for x
    x = 477,721.06/715.92
  6. Step 6: Final answer
    x = 667.28

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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.