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Finding the Fourth Proportional to 390.34, 585.70 and 159.39

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Solution

The fourth proportional to 390.34, 585.70 and 159.39 is: 239.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.34 : 585.70 = 159.39 : x
  2. Step 2: Convert to fraction form
    390.34/585.70 = 159.39/x
  3. Step 3: Cross multiply
    390.34x = 585.70 × 159.39
  4. Step 4: Simplify right side
    390.34x = 93,352.13
  5. Step 5: Solve for x
    x = 93,352.13/390.34
  6. Step 6: Final answer
    x = 239.16

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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.