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Finding the Fourth Proportional to 448.72, 619.58 and 317.90

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Solution

The fourth proportional to 448.72, 619.58 and 317.90 is: 438.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.72 : 619.58 = 317.90 : x
  2. Step 2: Convert to fraction form
    448.72/619.58 = 317.90/x
  3. Step 3: Cross multiply
    448.72x = 619.58 × 317.90
  4. Step 4: Simplify right side
    448.72x = 196,964.48
  5. Step 5: Solve for x
    x = 196,964.48/448.72
  6. Step 6: Final answer
    x = 438.95

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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.