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Finding the Fourth Proportional to 715.47, 986.72 and 482.91

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Solution

The fourth proportional to 715.47, 986.72 and 482.91 is: 665.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.47 : 986.72 = 482.91 : x
  2. Step 2: Convert to fraction form
    715.47/986.72 = 482.91/x
  3. Step 3: Cross multiply
    715.47x = 986.72 × 482.91
  4. Step 4: Simplify right side
    715.47x = 476,494.54
  5. Step 5: Solve for x
    x = 476,494.54/715.47
  6. Step 6: Final answer
    x = 665.99

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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.