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Finding the Fourth Proportional to 940.79, 1,409.99 and 478.68

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Solution

The fourth proportional to 940.79, 1,409.99 and 478.68 is: 717.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.79 : 1,409.99 = 478.68 : x
  2. Step 2: Convert to fraction form
    940.79/1,409.99 = 478.68/x
  3. Step 3: Cross multiply
    940.79x = 1,409.99 × 478.68
  4. Step 4: Simplify right side
    940.79x = 674,934.01
  5. Step 5: Solve for x
    x = 674,934.01/940.79
  6. Step 6: Final answer
    x = 717.42

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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.