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Finding the Fourth Proportional to 698.93, 1,047.77 and 265.78

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Solution

The fourth proportional to 698.93, 1,047.77 and 265.78 is: 398.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.93 : 1,047.77 = 265.78 : x
  2. Step 2: Convert to fraction form
    698.93/1,047.77 = 265.78/x
  3. Step 3: Cross multiply
    698.93x = 1,047.77 × 265.78
  4. Step 4: Simplify right side
    698.93x = 278,477.29
  5. Step 5: Solve for x
    x = 278,477.29/698.93
  6. Step 6: Final answer
    x = 398.43

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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.