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Finding the Fourth Proportional to 758.65, 1,051.28 and 712.42

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Solution

The fourth proportional to 758.65, 1,051.28 and 712.42 is: 987.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.65 : 1,051.28 = 712.42 : x
  2. Step 2: Convert to fraction form
    758.65/1,051.28 = 712.42/x
  3. Step 3: Cross multiply
    758.65x = 1,051.28 × 712.42
  4. Step 4: Simplify right side
    758.65x = 748,952.90
  5. Step 5: Solve for x
    x = 748,952.90/758.65
  6. Step 6: Final answer
    x = 987.22

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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.