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Finding the Fourth Proportional to 586.21, 808.55 and 399.62

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Solution

The fourth proportional to 586.21, 808.55 and 399.62 is: 551.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.21 : 808.55 = 399.62 : x
  2. Step 2: Convert to fraction form
    586.21/808.55 = 399.62/x
  3. Step 3: Cross multiply
    586.21x = 808.55 × 399.62
  4. Step 4: Simplify right side
    586.21x = 323,112.75
  5. Step 5: Solve for x
    x = 323,112.75/586.21
  6. Step 6: Final answer
    x = 551.19

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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.