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Finding the Fourth Proportional to 1,006.80, 1,389.31 and 587.13

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Solution

The fourth proportional to 1,006.80, 1,389.31 and 587.13 is: 810.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.80 : 1,389.31 = 587.13 : x
  2. Step 2: Convert to fraction form
    1,006.80/1,389.31 = 587.13/x
  3. Step 3: Cross multiply
    1,006.80x = 1,389.31 × 587.13
  4. Step 4: Simplify right side
    1,006.80x = 815,705.58
  5. Step 5: Solve for x
    x = 815,705.58/1,006.80
  6. Step 6: Final answer
    x = 810.20

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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.