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Finding the Fourth Proportional to 1,006.85, 1,389.47 and 587.21

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Solution

The fourth proportional to 1,006.85, 1,389.47 and 587.21 is: 810.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.85 : 1,389.47 = 587.21 : x
  2. Step 2: Convert to fraction form
    1,006.85/1,389.47 = 587.21/x
  3. Step 3: Cross multiply
    1,006.85x = 1,389.47 × 587.21
  4. Step 4: Simplify right side
    1,006.85x = 815,900.80
  5. Step 5: Solve for x
    x = 815,900.80/1,006.85
  6. Step 6: Final answer
    x = 810.35

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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.