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Finding the Fourth Proportional to 1,006.79, 1,389.38 and 587.43

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Solution

The fourth proportional to 1,006.79, 1,389.38 and 587.43 is: 810.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.79 : 1,389.38 = 587.43 : x
  2. Step 2: Convert to fraction form
    1,006.79/1,389.38 = 587.43/x
  3. Step 3: Cross multiply
    1,006.79x = 1,389.38 × 587.43
  4. Step 4: Simplify right side
    1,006.79x = 816,163.49
  5. Step 5: Solve for x
    x = 816,163.49/1,006.79
  6. Step 6: Final answer
    x = 810.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.