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Finding the Fourth Proportional to 390.47, 585.78 and 159.36

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Solution

The fourth proportional to 390.47, 585.78 and 159.36 is: 239.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.47 : 585.78 = 159.36 : x
  2. Step 2: Convert to fraction form
    390.47/585.78 = 159.36/x
  3. Step 3: Cross multiply
    390.47x = 585.78 × 159.36
  4. Step 4: Simplify right side
    390.47x = 93,349.90
  5. Step 5: Solve for x
    x = 93,349.90/390.47
  6. Step 6: Final answer
    x = 239.07

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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.