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Finding the Fourth Proportional to 390.93, 586.51 and 159.91

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Solution

The fourth proportional to 390.93, 586.51 and 159.91 is: 239.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.93 : 586.51 = 159.91 : x
  2. Step 2: Convert to fraction form
    390.93/586.51 = 159.91/x
  3. Step 3: Cross multiply
    390.93x = 586.51 × 159.91
  4. Step 4: Simplify right side
    390.93x = 93,786.95
  5. Step 5: Solve for x
    x = 93,786.95/390.93
  6. Step 6: Final answer
    x = 239.91

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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.