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Finding the Fourth Proportional to 68,970.93, 103,400.55 and 21,561.60

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Solution

The fourth proportional to 68,970.93, 103,400.55 and 21,561.60 is: 32,324.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,970.93 : 103,400.55 = 21,561.60 : x
  2. Step 2: Convert to fraction form
    68,970.93/103,400.55 = 21,561.60/x
  3. Step 3: Cross multiply
    68,970.93x = 103,400.55 × 21,561.60
  4. Step 4: Simplify right side
    68,970.93x = 2,229,481,686.63
  5. Step 5: Solve for x
    x = 2,229,481,686.63/68,970.93
  6. Step 6: Final answer
    x = 32,324.95

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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.