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Finding the Fourth Proportional to 390.87, 586.50 and 159.93

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Solution

The fourth proportional to 390.87, 586.50 and 159.93 is: 239.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.87 : 586.50 = 159.93 : x
  2. Step 2: Convert to fraction form
    390.87/586.50 = 159.93/x
  3. Step 3: Cross multiply
    390.87x = 586.50 × 159.93
  4. Step 4: Simplify right side
    390.87x = 93,798.95
  5. Step 5: Solve for x
    x = 93,798.95/390.87
  6. Step 6: Final answer
    x = 239.97

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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.