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Finding the Fourth Proportional to 930.87, 1,396.89 and 540.63

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Solution

The fourth proportional to 930.87, 1,396.89 and 540.63 is: 811.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.87 : 1,396.89 = 540.63 : x
  2. Step 2: Convert to fraction form
    930.87/1,396.89 = 540.63/x
  3. Step 3: Cross multiply
    930.87x = 1,396.89 × 540.63
  4. Step 4: Simplify right side
    930.87x = 755,200.64
  5. Step 5: Solve for x
    x = 755,200.64/930.87
  6. Step 6: Final answer
    x = 811.28

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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.