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Finding the Fourth Proportional to 759.84, 1,053.78 and 712.32

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Solution

The fourth proportional to 759.84, 1,053.78 and 712.32 is: 987.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.84 : 1,053.78 = 712.32 : x
  2. Step 2: Convert to fraction form
    759.84/1,053.78 = 712.32/x
  3. Step 3: Cross multiply
    759.84x = 1,053.78 × 712.32
  4. Step 4: Simplify right side
    759.84x = 750,628.57
  5. Step 5: Solve for x
    x = 750,628.57/759.84
  6. Step 6: Final answer
    x = 987.88

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.