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Finding the Fourth Proportional to 1,287.48, 1,776.73 and 698.02

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Solution

The fourth proportional to 1,287.48, 1,776.73 and 698.02 is: 963.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.48 : 1,776.73 = 698.02 : x
  2. Step 2: Convert to fraction form
    1,287.48/1,776.73 = 698.02/x
  3. Step 3: Cross multiply
    1,287.48x = 1,776.73 × 698.02
  4. Step 4: Simplify right side
    1,287.48x = 1,240,193.07
  5. Step 5: Solve for x
    x = 1,240,193.07/1,287.48
  6. Step 6: Final answer
    x = 963.27

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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.