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Finding the Fourth Proportional to 927.87, 1,391.87 and 380.06

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Solution

The fourth proportional to 927.87, 1,391.87 and 380.06 is: 570.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.87 : 1,391.87 = 380.06 : x
  2. Step 2: Convert to fraction form
    927.87/1,391.87 = 380.06/x
  3. Step 3: Cross multiply
    927.87x = 1,391.87 × 380.06
  4. Step 4: Simplify right side
    927.87x = 528,994.11
  5. Step 5: Solve for x
    x = 528,994.11/927.87
  6. Step 6: Final answer
    x = 570.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.