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Finding the Fourth Proportional to 768.76, 1,152.69 and 422.00

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Solution

The fourth proportional to 768.76, 1,152.69 and 422.00 is: 632.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.76 : 1,152.69 = 422.00 : x
  2. Step 2: Convert to fraction form
    768.76/1,152.69 = 422.00/x
  3. Step 3: Cross multiply
    768.76x = 1,152.69 × 422.00
  4. Step 4: Simplify right side
    768.76x = 486,441.01
  5. Step 5: Solve for x
    x = 486,441.01/768.76
  6. Step 6: Final answer
    x = 632.76

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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.