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Finding the Fourth Proportional to 942.30, 1,299.99 and 679.74

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Solution

The fourth proportional to 942.30, 1,299.99 and 679.74 is: 937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.30 : 1,299.99 = 679.74 : x
  2. Step 2: Convert to fraction form
    942.30/1,299.99 = 679.74/x
  3. Step 3: Cross multiply
    942.30x = 1,299.99 × 679.74
  4. Step 4: Simplify right side
    942.30x = 883,655.20
  5. Step 5: Solve for x
    x = 883,655.20/942.30
  6. Step 6: Final answer
    x = 937.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.