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Finding the Fourth Proportional to 764.87, 1,147.70 and 278.25

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Solution

The fourth proportional to 764.87, 1,147.70 and 278.25 is: 417.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.87 : 1,147.70 = 278.25 : x
  2. Step 2: Convert to fraction form
    764.87/1,147.70 = 278.25/x
  3. Step 3: Cross multiply
    764.87x = 1,147.70 × 278.25
  4. Step 4: Simplify right side
    764.87x = 319,346.13
  5. Step 5: Solve for x
    x = 319,346.13/764.87
  6. Step 6: Final answer
    x = 417.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.