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Finding the Fourth Proportional to 100,611.39, 138,785.90 and 62,820.03

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Solution

The fourth proportional to 100,611.39, 138,785.90 and 62,820.03 is: 86,655.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,611.39 : 138,785.90 = 62,820.03 : x
  2. Step 2: Convert to fraction form
    100,611.39/138,785.90 = 62,820.03/x
  3. Step 3: Cross multiply
    100,611.39x = 138,785.90 × 62,820.03
  4. Step 4: Simplify right side
    100,611.39x = 8,718,534,558.63
  5. Step 5: Solve for x
    x = 8,718,534,558.63/100,611.39
  6. Step 6: Final answer
    x = 86,655.54

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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.