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Finding the Fourth Proportional to 652,128.30, 978,192.45 and 400,185.90

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Solution

The fourth proportional to 652,128.30, 978,192.45 and 400,185.90 is: 600,278.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,128.30 : 978,192.45 = 400,185.90 : x
  2. Step 2: Convert to fraction form
    652,128.30/978,192.45 = 400,185.90/x
  3. Step 3: Cross multiply
    652,128.30x = 978,192.45 × 400,185.90
  4. Step 4: Simplify right side
    652,128.30x = 391,458,825,976.46
  5. Step 5: Solve for x
    x = 391,458,825,976.46/652,128.30
  6. Step 6: Final answer
    x = 600,278.85

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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.