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Finding the Fourth Proportional to 100,634.70, 138,889.02 and 64,928.58

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Solution

The fourth proportional to 100,634.70, 138,889.02 and 64,928.58 is: 89,609.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,634.70 : 138,889.02 = 64,928.58 : x
  2. Step 2: Convert to fraction form
    100,634.70/138,889.02 = 64,928.58/x
  3. Step 3: Cross multiply
    100,634.70x = 138,889.02 × 64,928.58
  4. Step 4: Simplify right side
    100,634.70x = 9,017,866,846.19
  5. Step 5: Solve for x
    x = 9,017,866,846.19/100,634.70
  6. Step 6: Final answer
    x = 89,609.91

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1.5x scale

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.