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Finding the Fourth Proportional to 808.18, 1,115.40 and 587.04

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Solution

The fourth proportional to 808.18, 1,115.40 and 587.04 is: 810.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.18 : 1,115.40 = 587.04 : x
  2. Step 2: Convert to fraction form
    808.18/1,115.40 = 587.04/x
  3. Step 3: Cross multiply
    808.18x = 1,115.40 × 587.04
  4. Step 4: Simplify right side
    808.18x = 654,784.42
  5. Step 5: Solve for x
    x = 654,784.42/808.18
  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.