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Finding the Fourth Proportional to 940.80, 1,410.42 and 478.80

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Solution

The fourth proportional to 940.80, 1,410.42 and 478.80 is: 717.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.80 : 1,410.42 = 478.80 : x
  2. Step 2: Convert to fraction form
    940.80/1,410.42 = 478.80/x
  3. Step 3: Cross multiply
    940.80x = 1,410.42 × 478.80
  4. Step 4: Simplify right side
    940.80x = 675,309.10
  5. Step 5: Solve for x
    x = 675,309.10/940.80
  6. Step 6: Final answer
    x = 717.80

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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.