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Finding the Fourth Proportional to 68,742.64, 103,108.80 and 21,356.40

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Solution

The fourth proportional to 68,742.64, 103,108.80 and 21,356.40 is: 32,033.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,742.64 : 103,108.80 = 21,356.40 : x
  2. Step 2: Convert to fraction form
    68,742.64/103,108.80 = 21,356.40/x
  3. Step 3: Cross multiply
    68,742.64x = 103,108.80 × 21,356.40
  4. Step 4: Simplify right side
    68,742.64x = 2,202,032,776.32
  5. Step 5: Solve for x
    x = 2,202,032,776.32/68,742.64
  6. Step 6: Final answer
    x = 32,033.00

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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.