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Finding the Fourth Proportional to 939.06, 1,409.43 and 477.16

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Solution

The fourth proportional to 939.06, 1,409.43 and 477.16 is: 716.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.06 : 1,409.43 = 477.16 : x
  2. Step 2: Convert to fraction form
    939.06/1,409.43 = 477.16/x
  3. Step 3: Cross multiply
    939.06x = 1,409.43 × 477.16
  4. Step 4: Simplify right side
    939.06x = 672,521.88
  5. Step 5: Solve for x
    x = 672,521.88/939.06
  6. Step 6: Final answer
    x = 716.16

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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.