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Finding the Fourth Proportional to 1,287.52, 1,776.77 and 698.05

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Solution

The fourth proportional to 1,287.52, 1,776.77 and 698.05 is: 963.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.52 : 1,776.77 = 698.05 : x
  2. Step 2: Convert to fraction form
    1,287.52/1,776.77 = 698.05/x
  3. Step 3: Cross multiply
    1,287.52x = 1,776.77 × 698.05
  4. Step 4: Simplify right side
    1,287.52x = 1,240,278.26
  5. Step 5: Solve for x
    x = 1,240,278.26/1,287.52
  6. Step 6: Final answer
    x = 963.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.