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Finding the Fourth Proportional to 478.95, 718.41 and 448.20

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Solution

The fourth proportional to 478.95, 718.41 and 448.20 is: 672.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.95 : 718.41 = 448.20 : x
  2. Step 2: Convert to fraction form
    478.95/718.41 = 448.20/x
  3. Step 3: Cross multiply
    478.95x = 718.41 × 448.20
  4. Step 4: Simplify right side
    478.95x = 321,991.36
  5. Step 5: Solve for x
    x = 321,991.36/478.95
  6. Step 6: Final answer
    x = 672.29

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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.