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Finding the Fourth Proportional to 696.45, 1,044.71 and 407.69

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Solution

The fourth proportional to 696.45, 1,044.71 and 407.69 is: 611.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.45 : 1,044.71 = 407.69 : x
  2. Step 2: Convert to fraction form
    696.45/1,044.71 = 407.69/x
  3. Step 3: Cross multiply
    696.45x = 1,044.71 × 407.69
  4. Step 4: Simplify right side
    696.45x = 425,917.82
  5. Step 5: Solve for x
    x = 425,917.82/696.45
  6. Step 6: Final answer
    x = 611.56

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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.