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Finding the Fourth Proportional to 100,634.64, 138,888.93 and 64,928.52

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Solution

The fourth proportional to 100,634.64, 138,888.93 and 64,928.52 is: 89,609.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,634.64 : 138,888.93 = 64,928.52 : x
  2. Step 2: Convert to fraction form
    100,634.64/138,888.93 = 64,928.52/x
  3. Step 3: Cross multiply
    100,634.64x = 138,888.93 × 64,928.52
  4. Step 4: Simplify right side
    100,634.64x = 9,017,852,669.28
  5. Step 5: Solve for x
    x = 9,017,852,669.28/100,634.64
  6. Step 6: Final answer
    x = 89,609.83

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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.