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Finding the Fourth Proportional to 939.18, 1,407.14 and 905.16

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Solution

The fourth proportional to 939.18, 1,407.14 and 905.16 is: 1,356.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.18 : 1,407.14 = 905.16 : x
  2. Step 2: Convert to fraction form
    939.18/1,407.14 = 905.16/x
  3. Step 3: Cross multiply
    939.18x = 1,407.14 × 905.16
  4. Step 4: Simplify right side
    939.18x = 1,273,686.84
  5. Step 5: Solve for x
    x = 1,273,686.84/939.18
  6. Step 6: Final answer
    x = 1,356.17

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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.