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Finding the Fourth Proportional to 777.76, 1,167.20 and 485.69

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Solution

The fourth proportional to 777.76, 1,167.20 and 485.69 is: 728.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.76 : 1,167.20 = 485.69 : x
  2. Step 2: Convert to fraction form
    777.76/1,167.20 = 485.69/x
  3. Step 3: Cross multiply
    777.76x = 1,167.20 × 485.69
  4. Step 4: Simplify right side
    777.76x = 566,892.75
  5. Step 5: Solve for x
    x = 566,892.75/777.76
  6. Step 6: Final answer
    x = 728.88

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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.