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Finding the Fourth Proportional to 699.28, 1,048.60 and 314.52

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Solution

The fourth proportional to 699.28, 1,048.60 and 314.52 is: 471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.28 : 1,048.60 = 314.52 : x
  2. Step 2: Convert to fraction form
    699.28/1,048.60 = 314.52/x
  3. Step 3: Cross multiply
    699.28x = 1,048.60 × 314.52
  4. Step 4: Simplify right side
    699.28x = 329,805.67
  5. Step 5: Solve for x
    x = 329,805.67/699.28
  6. Step 6: Final answer
    x = 471.64

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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.