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Finding the Fourth Proportional to 1,405.18, 1,938.74 and 908.11

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Solution

The fourth proportional to 1,405.18, 1,938.74 and 908.11 is: 1,252.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.18 : 1,938.74 = 908.11 : x
  2. Step 2: Convert to fraction form
    1,405.18/1,938.74 = 908.11/x
  3. Step 3: Cross multiply
    1,405.18x = 1,938.74 × 908.11
  4. Step 4: Simplify right side
    1,405.18x = 1,760,591.45
  5. Step 5: Solve for x
    x = 1,760,591.45/1,405.18
  6. Step 6: Final answer
    x = 1,252.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.