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Finding the Fourth Proportional to 1,391.04, 1,916.64 and 997.92

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Solution

The fourth proportional to 1,391.04, 1,916.64 and 997.92 is: 1,374.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.04 : 1,916.64 = 997.92 : x
  2. Step 2: Convert to fraction form
    1,391.04/1,916.64 = 997.92/x
  3. Step 3: Cross multiply
    1,391.04x = 1,916.64 × 997.92
  4. Step 4: Simplify right side
    1,391.04x = 1,912,653.39
  5. Step 5: Solve for x
    x = 1,912,653.39/1,391.04
  6. Step 6: Final answer
    x = 1,374.98

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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.