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Finding the Fourth Proportional to 587.01, 809.91 and 390.81

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Solution

The fourth proportional to 587.01, 809.91 and 390.81 is: 539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.01 : 809.91 = 390.81 : x
  2. Step 2: Convert to fraction form
    587.01/809.91 = 390.81/x
  3. Step 3: Cross multiply
    587.01x = 809.91 × 390.81
  4. Step 4: Simplify right side
    587.01x = 316,520.93
  5. Step 5: Solve for x
    x = 316,520.93/587.01
  6. Step 6: Final answer
    x = 539.21

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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.