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Finding the Fourth Proportional to 1,381.19, 1,905.92 and 813.93

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Solution

The fourth proportional to 1,381.19, 1,905.92 and 813.93 is: 1,123.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.19 : 1,905.92 = 813.93 : x
  2. Step 2: Convert to fraction form
    1,381.19/1,905.92 = 813.93/x
  3. Step 3: Cross multiply
    1,381.19x = 1,905.92 × 813.93
  4. Step 4: Simplify right side
    1,381.19x = 1,551,285.47
  5. Step 5: Solve for x
    x = 1,551,285.47/1,381.19
  6. Step 6: Final answer
    x = 1,123.16

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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.