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Finding the Fourth Proportional to 449.99, 621.19 and 317.32

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Solution

The fourth proportional to 449.99, 621.19 and 317.32 is: 438.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.99 : 621.19 = 317.32 : x
  2. Step 2: Convert to fraction form
    449.99/621.19 = 317.32/x
  3. Step 3: Cross multiply
    449.99x = 621.19 × 317.32
  4. Step 4: Simplify right side
    449.99x = 197,114.64
  5. Step 5: Solve for x
    x = 197,114.64/449.99
  6. Step 6: Final answer
    x = 438.04

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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.