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Finding the Fourth Proportional to 390.79, 586.19 and 159.63

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Solution

The fourth proportional to 390.79, 586.19 and 159.63 is: 239.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.79 : 586.19 = 159.63 : x
  2. Step 2: Convert to fraction form
    390.79/586.19 = 159.63/x
  3. Step 3: Cross multiply
    390.79x = 586.19 × 159.63
  4. Step 4: Simplify right side
    390.79x = 93,572.71
  5. Step 5: Solve for x
    x = 93,572.71/390.79
  6. Step 6: Final answer
    x = 239.45

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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.