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Finding the Fourth Proportional to 478.55, 660.47 and 292.15

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Solution

The fourth proportional to 478.55, 660.47 and 292.15 is: 403.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.55 : 660.47 = 292.15 : x
  2. Step 2: Convert to fraction form
    478.55/660.47 = 292.15/x
  3. Step 3: Cross multiply
    478.55x = 660.47 × 292.15
  4. Step 4: Simplify right side
    478.55x = 192,953.45
  5. Step 5: Solve for x
    x = 192,953.45/478.55
  6. Step 6: Final answer
    x = 403.21

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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.