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Finding the Fourth Proportional to 390.17, 585.41 and 146.76

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Solution

The fourth proportional to 390.17, 585.41 and 146.76 is: 220.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.17 : 585.41 = 146.76 : x
  2. Step 2: Convert to fraction form
    390.17/585.41 = 146.76/x
  3. Step 3: Cross multiply
    390.17x = 585.41 × 146.76
  4. Step 4: Simplify right side
    390.17x = 85,914.04
  5. Step 5: Solve for x
    x = 85,914.04/390.17
  6. Step 6: Final answer
    x = 220.20

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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.