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Finding the Fourth Proportional to 100,611.63, 138,748.80 and 66,095.40

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Solution

The fourth proportional to 100,611.63, 138,748.80 and 66,095.40 is: 91,149.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,611.63 : 138,748.80 = 66,095.40 : x
  2. Step 2: Convert to fraction form
    100,611.63/138,748.80 = 66,095.40/x
  3. Step 3: Cross multiply
    100,611.63x = 138,748.80 × 66,095.40
  4. Step 4: Simplify right side
    100,611.63x = 9,170,657,435.52
  5. Step 5: Solve for x
    x = 9,170,657,435.52/100,611.63
  6. Step 6: Final answer
    x = 91,149.08

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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.