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Finding the Fourth Proportional to 640,616.72, 961,124.97 and 191,355.31

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Solution

The fourth proportional to 640,616.72, 961,124.97 and 191,355.31 is: 287,092.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,616.72 : 961,124.97 = 191,355.31 : x
  2. Step 2: Convert to fraction form
    640,616.72/961,124.97 = 191,355.31/x
  3. Step 3: Cross multiply
    640,616.72x = 961,124.97 × 191,355.31
  4. Step 4: Simplify right side
    640,616.72x = 183,916,364,180.28
  5. Step 5: Solve for x
    x = 183,916,364,180.28/640,616.72
  6. Step 6: Final answer
    x = 287,092.67

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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.