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Finding the Fourth Proportional to 476.64, 715.20 and 220

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Solution

The fourth proportional to 476.64, 715.20 and 220 is: 330.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.64 : 715.20 = 220 : x
  2. Step 2: Convert to fraction form
    476.64/715.20 = 220/x
  3. Step 3: Cross multiply
    476.64x = 715.20 × 220
  4. Step 4: Simplify right side
    476.64x = 157,344
  5. Step 5: Solve for x
    x = 157,344/476.64
  6. Step 6: Final answer
    x = 330.11

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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.