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Finding the Fourth Proportional to 849.78, 1,276.29 and 485.28

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Solution

The fourth proportional to 849.78, 1,276.29 and 485.28 is: 728.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.78 : 1,276.29 = 485.28 : x
  2. Step 2: Convert to fraction form
    849.78/1,276.29 = 485.28/x
  3. Step 3: Cross multiply
    849.78x = 1,276.29 × 485.28
  4. Step 4: Simplify right side
    849.78x = 619,358.01
  5. Step 5: Solve for x
    x = 619,358.01/849.78
  6. Step 6: Final answer
    x = 728.85

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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.