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Finding the Fourth Proportional to 101,378.60, 152,067.90 and 90,103.40

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Solution

The fourth proportional to 101,378.60, 152,067.90 and 90,103.40 is: 135,155.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,378.60 : 152,067.90 = 90,103.40 : x
  2. Step 2: Convert to fraction form
    101,378.60/152,067.90 = 90,103.40/x
  3. Step 3: Cross multiply
    101,378.60x = 152,067.90 × 90,103.40
  4. Step 4: Simplify right side
    101,378.60x = 13,701,834,820.86
  5. Step 5: Solve for x
    x = 13,701,834,820.86/101,378.60
  6. Step 6: Final answer
    x = 135,155.10

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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.