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Finding the Fourth Proportional to 317.99, 477.23 and 220.50

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Solution

The fourth proportional to 317.99, 477.23 and 220.50 is: 330.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.99 : 477.23 = 220.50 : x
  2. Step 2: Convert to fraction form
    317.99/477.23 = 220.50/x
  3. Step 3: Cross multiply
    317.99x = 477.23 × 220.50
  4. Step 4: Simplify right side
    317.99x = 105,228.11
  5. Step 5: Solve for x
    x = 105,228.11/317.99
  6. Step 6: Final answer
    x = 330.91

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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.