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Finding the Fourth Proportional to 478.50, 721.45 and 383.46

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Solution

The fourth proportional to 478.50, 721.45 and 383.46 is: 578.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.50 : 721.45 = 383.46 : x
  2. Step 2: Convert to fraction form
    478.50/721.45 = 383.46/x
  3. Step 3: Cross multiply
    478.50x = 721.45 × 383.46
  4. Step 4: Simplify right side
    478.50x = 276,647.22
  5. Step 5: Solve for x
    x = 276,647.22/478.50
  6. Step 6: Final answer
    x = 578.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.