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Finding the Fourth Proportional to 478.55, 718.23 and 218.94

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Solution

The fourth proportional to 478.55, 718.23 and 218.94 is: 328.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.55 : 718.23 = 218.94 : x
  2. Step 2: Convert to fraction form
    478.55/718.23 = 218.94/x
  3. Step 3: Cross multiply
    478.55x = 718.23 × 218.94
  4. Step 4: Simplify right side
    478.55x = 157,249.28
  5. Step 5: Solve for x
    x = 157,249.28/478.55
  6. Step 6: Final answer
    x = 328.60

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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.