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Finding the Fourth Proportional to 390.65, 586.10 and 116.80

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Solution

The fourth proportional to 390.65, 586.10 and 116.80 is: 175.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.65 : 586.10 = 116.80 : x
  2. Step 2: Convert to fraction form
    390.65/586.10 = 116.80/x
  3. Step 3: Cross multiply
    390.65x = 586.10 × 116.80
  4. Step 4: Simplify right side
    390.65x = 68,455.31
  5. Step 5: Solve for x
    x = 68,455.31/390.65
  6. Step 6: Final answer
    x = 175.24

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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.