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Finding the Fourth Proportional to 935.67, 1,403.46 and 319.13

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Solution

The fourth proportional to 935.67, 1,403.46 and 319.13 is: 478.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.67 : 1,403.46 = 319.13 : x
  2. Step 2: Convert to fraction form
    935.67/1,403.46 = 319.13/x
  3. Step 3: Cross multiply
    935.67x = 1,403.46 × 319.13
  4. Step 4: Simplify right side
    935.67x = 447,879.17
  5. Step 5: Solve for x
    x = 447,879.17/935.67
  6. Step 6: Final answer
    x = 478.67

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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.