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Finding the Fourth Proportional to 764.19, 1,145.60 and 277.13

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Solution

The fourth proportional to 764.19, 1,145.60 and 277.13 is: 415.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.19 : 1,145.60 = 277.13 : x
  2. Step 2: Convert to fraction form
    764.19/1,145.60 = 277.13/x
  3. Step 3: Cross multiply
    764.19x = 1,145.60 × 277.13
  4. Step 4: Simplify right side
    764.19x = 317,480.13
  5. Step 5: Solve for x
    x = 317,480.13/764.19
  6. Step 6: Final answer
    x = 415.45

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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.