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Finding the Fourth Proportional to 715.44, 986.76 and 478.96

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Solution

The fourth proportional to 715.44, 986.76 and 478.96 is: 660.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.44 : 986.76 = 478.96 : x
  2. Step 2: Convert to fraction form
    715.44/986.76 = 478.96/x
  3. Step 3: Cross multiply
    715.44x = 986.76 × 478.96
  4. Step 4: Simplify right side
    715.44x = 472,618.57
  5. Step 5: Solve for x
    x = 472,618.57/715.44
  6. Step 6: Final answer
    x = 660.60

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Double scale
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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.