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Finding the Fourth Proportional to 1,287.51, 1,776.75 and 698.04

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Solution

The fourth proportional to 1,287.51, 1,776.75 and 698.04 is: 963.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.51 : 1,776.75 = 698.04 : x
  2. Step 2: Convert to fraction form
    1,287.51/1,776.75 = 698.04/x
  3. Step 3: Cross multiply
    1,287.51x = 1,776.75 × 698.04
  4. Step 4: Simplify right side
    1,287.51x = 1,240,242.57
  5. Step 5: Solve for x
    x = 1,240,242.57/1,287.51
  6. Step 6: Final answer
    x = 963.29

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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.