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Finding the Fourth Proportional to 939.48, 1,406.91 and 476.63

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Solution

The fourth proportional to 939.48, 1,406.91 and 476.63 is: 713.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.48 : 1,406.91 = 476.63 : x
  2. Step 2: Convert to fraction form
    939.48/1,406.91 = 476.63/x
  3. Step 3: Cross multiply
    939.48x = 1,406.91 × 476.63
  4. Step 4: Simplify right side
    939.48x = 670,568.48
  5. Step 5: Solve for x
    x = 670,568.48/939.48
  6. Step 6: Final answer
    x = 713.77

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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.