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Finding the Fourth Proportional to 74,661.40, 111,919.20 and 66,788.20

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Solution

The fourth proportional to 74,661.40, 111,919.20 and 66,788.20 is: 100,117.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,661.40 : 111,919.20 = 66,788.20 : x
  2. Step 2: Convert to fraction form
    74,661.40/111,919.20 = 66,788.20/x
  3. Step 3: Cross multiply
    74,661.40x = 111,919.20 × 66,788.20
  4. Step 4: Simplify right side
    74,661.40x = 7,474,881,913.44
  5. Step 5: Solve for x
    x = 7,474,881,913.44/74,661.40
  6. Step 6: Final answer
    x = 100,117.09

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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.