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Finding the Fourth Proportional to 317.99, 476.78 and 144.74

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Solution

The fourth proportional to 317.99, 476.78 and 144.74 is: 217.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.99 : 476.78 = 144.74 : x
  2. Step 2: Convert to fraction form
    317.99/476.78 = 144.74/x
  3. Step 3: Cross multiply
    317.99x = 476.78 × 144.74
  4. Step 4: Simplify right side
    317.99x = 69,006.03
  5. Step 5: Solve for x
    x = 69,006.03/317.99
  6. Step 6: Final answer
    x = 217.01

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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.