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Finding the Fourth Proportional to 390.86, 586.44 and 174.29

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Solution

The fourth proportional to 390.86, 586.44 and 174.29 is: 261.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.86 : 586.44 = 174.29 : x
  2. Step 2: Convert to fraction form
    390.86/586.44 = 174.29/x
  3. Step 3: Cross multiply
    390.86x = 586.44 × 174.29
  4. Step 4: Simplify right side
    390.86x = 102,210.63
  5. Step 5: Solve for x
    x = 102,210.63/390.86
  6. Step 6: Final answer
    x = 261.50

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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.