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Finding the Fourth Proportional to 90,611.84, 135,912.96 and 28,275.20

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Solution

The fourth proportional to 90,611.84, 135,912.96 and 28,275.20 is: 42,411.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,611.84 : 135,912.96 = 28,275.20 : x
  2. Step 2: Convert to fraction form
    90,611.84/135,912.96 = 28,275.20/x
  3. Step 3: Cross multiply
    90,611.84x = 135,912.96 × 28,275.20
  4. Step 4: Simplify right side
    90,611.84x = 3,842,966,126.59
  5. Step 5: Solve for x
    x = 3,842,966,126.59/90,611.84
  6. Step 6: Final answer
    x = 42,411.30

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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.