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Finding the Fourth Proportional to 90,439.40, 135,659.10 and 72,943.40

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Solution

The fourth proportional to 90,439.40, 135,659.10 and 72,943.40 is: 109,415.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,439.40 : 135,659.10 = 72,943.40 : x
  2. Step 2: Convert to fraction form
    90,439.40/135,659.10 = 72,943.40/x
  3. Step 3: Cross multiply
    90,439.40x = 135,659.10 × 72,943.40
  4. Step 4: Simplify right side
    90,439.40x = 9,895,435,994.94
  5. Step 5: Solve for x
    x = 9,895,435,994.94/90,439.40
  6. Step 6: Final answer
    x = 109,415.10

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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.