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Finding the Fourth Proportional to 764.32, 1,145.45 and 417.13

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Solution

The fourth proportional to 764.32, 1,145.45 and 417.13 is: 625.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.32 : 1,145.45 = 417.13 : x
  2. Step 2: Convert to fraction form
    764.32/1,145.45 = 417.13/x
  3. Step 3: Cross multiply
    764.32x = 1,145.45 × 417.13
  4. Step 4: Simplify right side
    764.32x = 477,799.47
  5. Step 5: Solve for x
    x = 477,799.47/764.32
  6. Step 6: Final answer
    x = 625.13

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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.