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Finding the Fourth Proportional to 90,689.40, 135,969.30 and 40,728.60

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Solution

The fourth proportional to 90,689.40, 135,969.30 and 40,728.60 is: 61,063.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,689.40 : 135,969.30 = 40,728.60 : x
  2. Step 2: Convert to fraction form
    90,689.40/135,969.30 = 40,728.60/x
  3. Step 3: Cross multiply
    90,689.40x = 135,969.30 × 40,728.60
  4. Step 4: Simplify right side
    90,689.40x = 5,537,839,231.98
  5. Step 5: Solve for x
    x = 5,537,839,231.98/90,689.40
  6. Step 6: Final answer
    x = 61,063.80

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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.