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Finding the Fourth Proportional to 90,410.90, 135,616.35 and 72,914.90

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Solution

The fourth proportional to 90,410.90, 135,616.35 and 72,914.90 is: 109,372.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,410.90 : 135,616.35 = 72,914.90 : x
  2. Step 2: Convert to fraction form
    90,410.90/135,616.35 = 72,914.90/x
  3. Step 3: Cross multiply
    90,410.90x = 135,616.35 × 72,914.90
  4. Step 4: Simplify right side
    90,410.90x = 9,888,452,598.62
  5. Step 5: Solve for x
    x = 9,888,452,598.62/90,410.90
  6. Step 6: Final answer
    x = 109,372.35

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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.