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Finding the Fourth Proportional to 710.87, 1,067.15 and 693.20

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Solution

The fourth proportional to 710.87, 1,067.15 and 693.20 is: 1,040.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.87 : 1,067.15 = 693.20 : x
  2. Step 2: Convert to fraction form
    710.87/1,067.15 = 693.20/x
  3. Step 3: Cross multiply
    710.87x = 1,067.15 × 693.20
  4. Step 4: Simplify right side
    710.87x = 739,752.78
  5. Step 5: Solve for x
    x = 739,752.78/710.87
  6. Step 6: Final answer
    x = 1,040.64

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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.