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Finding the Fourth Proportional to 935.88, 1,403.88 and 415.76

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Solution

The fourth proportional to 935.88, 1,403.88 and 415.76 is: 623.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.88 : 1,403.88 = 415.76 : x
  2. Step 2: Convert to fraction form
    935.88/1,403.88 = 415.76/x
  3. Step 3: Cross multiply
    935.88x = 1,403.88 × 415.76
  4. Step 4: Simplify right side
    935.88x = 583,677.15
  5. Step 5: Solve for x
    x = 583,677.15/935.88
  6. Step 6: Final answer
    x = 623.67

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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.