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Finding the Fourth Proportional to 711.56, 979.90 and 514.76

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Solution

The fourth proportional to 711.56, 979.90 and 514.76 is: 708.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.56 : 979.90 = 514.76 : x
  2. Step 2: Convert to fraction form
    711.56/979.90 = 514.76/x
  3. Step 3: Cross multiply
    711.56x = 979.90 × 514.76
  4. Step 4: Simplify right side
    711.56x = 504,413.32
  5. Step 5: Solve for x
    x = 504,413.32/711.56
  6. Step 6: Final answer
    x = 708.88

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Half scale
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Double scale
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1.5x scale

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.