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Finding the Fourth Proportional to 390.66, 586.20 and 174.24

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Solution

The fourth proportional to 390.66, 586.20 and 174.24 is: 261.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.66 : 586.20 = 174.24 : x
  2. Step 2: Convert to fraction form
    390.66/586.20 = 174.24/x
  3. Step 3: Cross multiply
    390.66x = 586.20 × 174.24
  4. Step 4: Simplify right side
    390.66x = 102,139.49
  5. Step 5: Solve for x
    x = 102,139.49/390.66
  6. Step 6: Final answer
    x = 261.45

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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.