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Finding the Fourth Proportional to 699.28, 1,047.96 and 374.80

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Solution

The fourth proportional to 699.28, 1,047.96 and 374.80 is: 561.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.28 : 1,047.96 = 374.80 : x
  2. Step 2: Convert to fraction form
    699.28/1,047.96 = 374.80/x
  3. Step 3: Cross multiply
    699.28x = 1,047.96 × 374.80
  4. Step 4: Simplify right side
    699.28x = 392,775.41
  5. Step 5: Solve for x
    x = 392,775.41/699.28
  6. Step 6: Final answer
    x = 561.69

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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.