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Finding the Fourth Proportional to 640,605.40, 960,908.10 and 404,992.60

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Solution

The fourth proportional to 640,605.40, 960,908.10 and 404,992.60 is: 607,488.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,605.40 : 960,908.10 = 404,992.60 : x
  2. Step 2: Convert to fraction form
    640,605.40/960,908.10 = 404,992.60/x
  3. Step 3: Cross multiply
    640,605.40x = 960,908.10 × 404,992.60
  4. Step 4: Simplify right side
    640,605.40x = 389,160,669,780.06
  5. Step 5: Solve for x
    x = 389,160,669,780.06/640,605.40
  6. Step 6: Final answer
    x = 607,488.90

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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.