Home / 1,387-1,916.78-1,137.92

Finding the Fourth Proportional to 1,387, 1,916.78 and 1,137.92

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Solution

The fourth proportional to 1,387, 1,916.78 and 1,137.92 is: 1,572.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 1,916.78 = 1,137.92 : x
  2. Step 2: Convert to fraction form
    1,387/1,916.78 = 1,137.92/x
  3. Step 3: Cross multiply
    1,387x = 1,916.78 × 1,137.92
  4. Step 4: Simplify right side
    1,387x = 2,181,142.30
  5. Step 5: Solve for x
    x = 2,181,142.30/1,387
  6. Step 6: Final answer
    x = 1,572.56

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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.