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Finding the Fourth Proportional to 390.92, 586.44 and 117.10

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Solution

The fourth proportional to 390.92, 586.44 and 117.10 is: 175.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.92 : 586.44 = 117.10 : x
  2. Step 2: Convert to fraction form
    390.92/586.44 = 117.10/x
  3. Step 3: Cross multiply
    390.92x = 586.44 × 117.10
  4. Step 4: Simplify right side
    390.92x = 68,670.66
  5. Step 5: Solve for x
    x = 68,670.66/390.92
  6. Step 6: Final answer
    x = 175.66

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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.