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Finding the Fourth Proportional to 935.76, 1,403.91 and 387.66

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Solution

The fourth proportional to 935.76, 1,403.91 and 387.66 is: 581.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.76 : 1,403.91 = 387.66 : x
  2. Step 2: Convert to fraction form
    935.76/1,403.91 = 387.66/x
  3. Step 3: Cross multiply
    935.76x = 1,403.91 × 387.66
  4. Step 4: Simplify right side
    935.76x = 544,239.75
  5. Step 5: Solve for x
    x = 544,239.75/935.76
  6. Step 6: Final answer
    x = 581.60

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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.