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Finding the Fourth Proportional to 390.79, 586.17 and 102.22

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Solution

The fourth proportional to 390.79, 586.17 and 102.22 is: 153.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.79 : 586.17 = 102.22 : x
  2. Step 2: Convert to fraction form
    390.79/586.17 = 102.22/x
  3. Step 3: Cross multiply
    390.79x = 586.17 × 102.22
  4. Step 4: Simplify right side
    390.79x = 59,918.30
  5. Step 5: Solve for x
    x = 59,918.30/390.79
  6. Step 6: Final answer
    x = 153.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.