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Finding the Fourth Proportional to 1,387.86, 1,916.01 and 946.41

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Solution

The fourth proportional to 1,387.86, 1,916.01 and 946.41 is: 1,306.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.86 : 1,916.01 = 946.41 : x
  2. Step 2: Convert to fraction form
    1,387.86/1,916.01 = 946.41/x
  3. Step 3: Cross multiply
    1,387.86x = 1,916.01 × 946.41
  4. Step 4: Simplify right side
    1,387.86x = 1,813,331.02
  5. Step 5: Solve for x
    x = 1,813,331.02/1,387.86
  6. Step 6: Final answer
    x = 1,306.57

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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.