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Finding the Fourth Proportional to 940.77, 1,409.96 and 478.67

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Solution

The fourth proportional to 940.77, 1,409.96 and 478.67 is: 717.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.77 : 1,409.96 = 478.67 : x
  2. Step 2: Convert to fraction form
    940.77/1,409.96 = 478.67/x
  3. Step 3: Cross multiply
    940.77x = 1,409.96 × 478.67
  4. Step 4: Simplify right side
    940.77x = 674,896.11
  5. Step 5: Solve for x
    x = 674,896.11/940.77
  6. Step 6: Final answer
    x = 717.39

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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.