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Finding the Fourth Proportional to 860.61, 1,279.87 and 833.27

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Solution

The fourth proportional to 860.61, 1,279.87 and 833.27 is: 1,239.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.61 : 1,279.87 = 833.27 : x
  2. Step 2: Convert to fraction form
    860.61/1,279.87 = 833.27/x
  3. Step 3: Cross multiply
    860.61x = 1,279.87 × 833.27
  4. Step 4: Simplify right side
    860.61x = 1,066,477.27
  5. Step 5: Solve for x
    x = 1,066,477.27/860.61
  6. Step 6: Final answer
    x = 1,239.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.