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Finding the Fourth Proportional to 390.94, 586.66 and 147.44

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Solution

The fourth proportional to 390.94, 586.66 and 147.44 is: 221.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.94 : 586.66 = 147.44 : x
  2. Step 2: Convert to fraction form
    390.94/586.66 = 147.44/x
  3. Step 3: Cross multiply
    390.94x = 586.66 × 147.44
  4. Step 4: Simplify right side
    390.94x = 86,497.15
  5. Step 5: Solve for x
    x = 86,497.15/390.94
  6. Step 6: Final answer
    x = 221.25

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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.