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Finding the Fourth Proportional to 935.87, 1,404.20 and 388.17

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Solution

The fourth proportional to 935.87, 1,404.20 and 388.17 is: 582.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.87 : 1,404.20 = 388.17 : x
  2. Step 2: Convert to fraction form
    935.87/1,404.20 = 388.17/x
  3. Step 3: Cross multiply
    935.87x = 1,404.20 × 388.17
  4. Step 4: Simplify right side
    935.87x = 545,068.31
  5. Step 5: Solve for x
    x = 545,068.31/935.87
  6. Step 6: Final answer
    x = 582.42

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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.