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Finding the Fourth Proportional to 66,742.71, 100,117.39 and 19,991.13

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Solution

The fourth proportional to 66,742.71, 100,117.39 and 19,991.13 is: 29,987.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,742.71 : 100,117.39 = 19,991.13 : x
  2. Step 2: Convert to fraction form
    66,742.71/100,117.39 = 19,991.13/x
  3. Step 3: Cross multiply
    66,742.71x = 100,117.39 × 19,991.13
  4. Step 4: Simplify right side
    66,742.71x = 2,001,459,758.75
  5. Step 5: Solve for x
    x = 2,001,459,758.75/66,742.71
  6. Step 6: Final answer
    x = 29,987.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.