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Finding the Fourth Proportional to 390.18, 585.33 and 143.37

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Solution

The fourth proportional to 390.18, 585.33 and 143.37 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.18 : 585.33 = 143.37 : x
  2. Step 2: Convert to fraction form
    390.18/585.33 = 143.37/x
  3. Step 3: Cross multiply
    390.18x = 585.33 × 143.37
  4. Step 4: Simplify right side
    390.18x = 83,918.76
  5. Step 5: Solve for x
    x = 83,918.76/390.18
  6. Step 6: Final answer
    x = 215.08

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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.