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Finding the Fourth Proportional to 764.72, 1,152.73 and 720.12

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Solution

The fourth proportional to 764.72, 1,152.73 and 720.12 is: 1,085.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.72 : 1,152.73 = 720.12 : x
  2. Step 2: Convert to fraction form
    764.72/1,152.73 = 720.12/x
  3. Step 3: Cross multiply
    764.72x = 1,152.73 × 720.12
  4. Step 4: Simplify right side
    764.72x = 830,103.93
  5. Step 5: Solve for x
    x = 830,103.93/764.72
  6. Step 6: Final answer
    x = 1,085.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.