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Finding the Fourth Proportional to 935.55, 1,403.53 and 387.43

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Solution

The fourth proportional to 935.55, 1,403.53 and 387.43 is: 581.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.55 : 1,403.53 = 387.43 : x
  2. Step 2: Convert to fraction form
    935.55/1,403.53 = 387.43/x
  3. Step 3: Cross multiply
    935.55x = 1,403.53 × 387.43
  4. Step 4: Simplify right side
    935.55x = 543,773.05
  5. Step 5: Solve for x
    x = 543,773.05/935.55
  6. Step 6: Final answer
    x = 581.23

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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.