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Finding the Fourth Proportional to 935.90, 1,404.35 and 388.46

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Solution

The fourth proportional to 935.90, 1,404.35 and 388.46 is: 582.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.90 : 1,404.35 = 388.46 : x
  2. Step 2: Convert to fraction form
    935.90/1,404.35 = 388.46/x
  3. Step 3: Cross multiply
    935.90x = 1,404.35 × 388.46
  4. Step 4: Simplify right side
    935.90x = 545,533.80
  5. Step 5: Solve for x
    x = 545,533.80/935.90
  6. Step 6: Final answer
    x = 582.90

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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.