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Finding the Fourth Proportional to 62,640, 93,960 and 21,087

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Solution

The fourth proportional to 62,640, 93,960 and 21,087 is: 31,630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,640 : 93,960 = 21,087 : x
  2. Step 2: Convert to fraction form
    62,640/93,960 = 21,087/x
  3. Step 3: Cross multiply
    62,640x = 93,960 × 21,087
  4. Step 4: Simplify right side
    62,640x = 1,981,334,520
  5. Step 5: Solve for x
    x = 1,981,334,520/62,640
  6. Step 6: Final answer
    x = 31,630.50

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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.