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Finding the Fourth Proportional to 935.99, 1,405.80 and 762.78

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Solution

The fourth proportional to 935.99, 1,405.80 and 762.78 is: 1,145.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.99 : 1,405.80 = 762.78 : x
  2. Step 2: Convert to fraction form
    935.99/1,405.80 = 762.78/x
  3. Step 3: Cross multiply
    935.99x = 1,405.80 × 762.78
  4. Step 4: Simplify right side
    935.99x = 1,072,316.12
  5. Step 5: Solve for x
    x = 1,072,316.12/935.99
  6. Step 6: Final answer
    x = 1,145.66

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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.