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Finding the Fourth Proportional to 68,798.40, 103,213.76 and 21,411.04

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Solution

The fourth proportional to 68,798.40, 103,213.76 and 21,411.04 is: 32,121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,798.40 : 103,213.76 = 21,411.04 : x
  2. Step 2: Convert to fraction form
    68,798.40/103,213.76 = 21,411.04/x
  3. Step 3: Cross multiply
    68,798.40x = 103,213.76 × 21,411.04
  4. Step 4: Simplify right side
    68,798.40x = 2,209,913,943.91
  5. Step 5: Solve for x
    x = 2,209,913,943.91/68,798.40
  6. Step 6: Final answer
    x = 32,121.59

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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.