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Finding the Fourth Proportional to 476.90, 715.36 and 168.78

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Solution

The fourth proportional to 476.90, 715.36 and 168.78 is: 253.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.90 : 715.36 = 168.78 : x
  2. Step 2: Convert to fraction form
    476.90/715.36 = 168.78/x
  3. Step 3: Cross multiply
    476.90x = 715.36 × 168.78
  4. Step 4: Simplify right side
    476.90x = 120,738.46
  5. Step 5: Solve for x
    x = 120,738.46/476.90
  6. Step 6: Final answer
    x = 253.18

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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.