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Finding the Fourth Proportional to 390.69, 586.08 and 116.79

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Solution

The fourth proportional to 390.69, 586.08 and 116.79 is: 175.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.69 : 586.08 = 116.79 : x
  2. Step 2: Convert to fraction form
    390.69/586.08 = 116.79/x
  3. Step 3: Cross multiply
    390.69x = 586.08 × 116.79
  4. Step 4: Simplify right side
    390.69x = 68,448.28
  5. Step 5: Solve for x
    x = 68,448.28/390.69
  6. Step 6: Final answer
    x = 175.20

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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.