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Finding the Fourth Proportional to 43,287.70, 64,943.70 and 21,101.80

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Solution

The fourth proportional to 43,287.70, 64,943.70 and 21,101.80 is: 31,658.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,287.70 : 64,943.70 = 21,101.80 : x
  2. Step 2: Convert to fraction form
    43,287.70/64,943.70 = 21,101.80/x
  3. Step 3: Cross multiply
    43,287.70x = 64,943.70 × 21,101.80
  4. Step 4: Simplify right side
    43,287.70x = 1,370,428,968.66
  5. Step 5: Solve for x
    x = 1,370,428,968.66/43,287.70
  6. Step 6: Final answer
    x = 31,658.62

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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.