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Finding the Fourth Proportional to 478.40, 660.28 and 292.05

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Solution

The fourth proportional to 478.40, 660.28 and 292.05 is: 403.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.40 : 660.28 = 292.05 : x
  2. Step 2: Convert to fraction form
    478.40/660.28 = 292.05/x
  3. Step 3: Cross multiply
    478.40x = 660.28 × 292.05
  4. Step 4: Simplify right side
    478.40x = 192,834.87
  5. Step 5: Solve for x
    x = 192,834.87/478.40
  6. Step 6: Final answer
    x = 403.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.