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Finding the Fourth Proportional to 935.75, 1,409.20 and 815.47

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Solution

The fourth proportional to 935.75, 1,409.20 and 815.47 is: 1,228.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.75 : 1,409.20 = 815.47 : x
  2. Step 2: Convert to fraction form
    935.75/1,409.20 = 815.47/x
  3. Step 3: Cross multiply
    935.75x = 1,409.20 × 815.47
  4. Step 4: Simplify right side
    935.75x = 1,149,154.76
  5. Step 5: Solve for x
    x = 1,149,154.76/935.75
  6. Step 6: Final answer
    x = 1,228.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.