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Finding the Fourth Proportional to 100,561.70, 138,735.47 and 64,772.46

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Solution

The fourth proportional to 100,561.70, 138,735.47 and 64,772.46 is: 89,360.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,561.70 : 138,735.47 = 64,772.46 : x
  2. Step 2: Convert to fraction form
    100,561.70/138,735.47 = 64,772.46/x
  3. Step 3: Cross multiply
    100,561.70x = 138,735.47 × 64,772.46
  4. Step 4: Simplify right side
    100,561.70x = 8,986,237,478.74
  5. Step 5: Solve for x
    x = 8,986,237,478.74/100,561.70
  6. Step 6: Final answer
    x = 89,360.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.