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Finding the Fourth Proportional to 688.98, 1,033.76 and 298.78

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Solution

The fourth proportional to 688.98, 1,033.76 and 298.78 is: 448.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.98 : 1,033.76 = 298.78 : x
  2. Step 2: Convert to fraction form
    688.98/1,033.76 = 298.78/x
  3. Step 3: Cross multiply
    688.98x = 1,033.76 × 298.78
  4. Step 4: Simplify right side
    688.98x = 308,866.81
  5. Step 5: Solve for x
    x = 308,866.81/688.98
  6. Step 6: Final answer
    x = 448.30

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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.