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Finding the Fourth Proportional to 640,911.40, 961,367.10 and 640,911.40

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Solution

The fourth proportional to 640,911.40, 961,367.10 and 640,911.40 is: 961,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,911.40 : 961,367.10 = 640,911.40 : x
  2. Step 2: Convert to fraction form
    640,911.40/961,367.10 = 640,911.40/x
  3. Step 3: Cross multiply
    640,911.40x = 961,367.10 × 640,911.40
  4. Step 4: Simplify right side
    640,911.40x = 616,151,133,974.94
  5. Step 5: Solve for x
    x = 616,151,133,974.94/640,911.40
  6. Step 6: Final answer
    x = 961,367.10

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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.