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Finding the Fourth Proportional to 587.10, 810.90 and 390.27

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Solution

The fourth proportional to 587.10, 810.90 and 390.27 is: 539.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.10 : 810.90 = 390.27 : x
  2. Step 2: Convert to fraction form
    587.10/810.90 = 390.27/x
  3. Step 3: Cross multiply
    587.10x = 810.90 × 390.27
  4. Step 4: Simplify right side
    587.10x = 316,469.94
  5. Step 5: Solve for x
    x = 316,469.94/587.10
  6. Step 6: Final answer
    x = 539.04

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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.