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Finding the Fourth Proportional to 438.84, 658.73 and 390.40

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Solution

The fourth proportional to 438.84, 658.73 and 390.40 is: 586.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.84 : 658.73 = 390.40 : x
  2. Step 2: Convert to fraction form
    438.84/658.73 = 390.40/x
  3. Step 3: Cross multiply
    438.84x = 658.73 × 390.40
  4. Step 4: Simplify right side
    438.84x = 257,169.92
  5. Step 5: Solve for x
    x = 257,169.92/438.84
  6. Step 6: Final answer
    x = 586.02

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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.