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Finding the Fourth Proportional to 764.47, 1,145.67 and 398.51

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Solution

The fourth proportional to 764.47, 1,145.67 and 398.51 is: 597.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.47 : 1,145.67 = 398.51 : x
  2. Step 2: Convert to fraction form
    764.47/1,145.67 = 398.51/x
  3. Step 3: Cross multiply
    764.47x = 1,145.67 × 398.51
  4. Step 4: Simplify right side
    764.47x = 456,560.95
  5. Step 5: Solve for x
    x = 456,560.95/764.47
  6. Step 6: Final answer
    x = 597.23

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Double scale
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1.5x scale

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.