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Finding the Fourth Proportional to 764.76, 1,054.79 and 515.69

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Solution

The fourth proportional to 764.76, 1,054.79 and 515.69 is: 711.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.76 : 1,054.79 = 515.69 : x
  2. Step 2: Convert to fraction form
    764.76/1,054.79 = 515.69/x
  3. Step 3: Cross multiply
    764.76x = 1,054.79 × 515.69
  4. Step 4: Simplify right side
    764.76x = 543,939.44
  5. Step 5: Solve for x
    x = 543,939.44/764.76
  6. Step 6: Final answer
    x = 711.25

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Half scale
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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.