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Finding the Fourth Proportional to 780.48, 1,170.72 and 267.52

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Solution

The fourth proportional to 780.48, 1,170.72 and 267.52 is: 401.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.48 : 1,170.72 = 267.52 : x
  2. Step 2: Convert to fraction form
    780.48/1,170.72 = 267.52/x
  3. Step 3: Cross multiply
    780.48x = 1,170.72 × 267.52
  4. Step 4: Simplify right side
    780.48x = 313,191.01
  5. Step 5: Solve for x
    x = 313,191.01/780.48
  6. Step 6: Final answer
    x = 401.28

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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.