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Finding the Fourth Proportional to 1,132.74, 1,698.09 and 720.72

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Solution

The fourth proportional to 1,132.74, 1,698.09 and 720.72 is: 1,080.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.74 : 1,698.09 = 720.72 : x
  2. Step 2: Convert to fraction form
    1,132.74/1,698.09 = 720.72/x
  3. Step 3: Cross multiply
    1,132.74x = 1,698.09 × 720.72
  4. Step 4: Simplify right side
    1,132.74x = 1,223,838.93
  5. Step 5: Solve for x
    x = 1,223,838.93/1,132.74
  6. Step 6: Final answer
    x = 1,080.43

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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.