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Finding the Fourth Proportional to 1,007.80, 1,511.51 and 422.64

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Solution

The fourth proportional to 1,007.80, 1,511.51 and 422.64 is: 633.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.80 : 1,511.51 = 422.64 : x
  2. Step 2: Convert to fraction form
    1,007.80/1,511.51 = 422.64/x
  3. Step 3: Cross multiply
    1,007.80x = 1,511.51 × 422.64
  4. Step 4: Simplify right side
    1,007.80x = 638,818.69
  5. Step 5: Solve for x
    x = 638,818.69/1,007.80
  6. Step 6: Final answer
    x = 633.88

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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.