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Finding the Fourth Proportional to 672.33, 1,007.28 and 429.33

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Solution

The fourth proportional to 672.33, 1,007.28 and 429.33 is: 643.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.33 : 1,007.28 = 429.33 : x
  2. Step 2: Convert to fraction form
    672.33/1,007.28 = 429.33/x
  3. Step 3: Cross multiply
    672.33x = 1,007.28 × 429.33
  4. Step 4: Simplify right side
    672.33x = 432,455.52
  5. Step 5: Solve for x
    x = 432,455.52/672.33
  6. Step 6: Final answer
    x = 643.22

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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.