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Finding the Fourth Proportional to 66,685.57, 99,885.79 and 53,980.46

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Solution

The fourth proportional to 66,685.57, 99,885.79 and 53,980.46 is: 80,855.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,685.57 : 99,885.79 = 53,980.46 : x
  2. Step 2: Convert to fraction form
    66,685.57/99,885.79 = 53,980.46/x
  3. Step 3: Cross multiply
    66,685.57x = 99,885.79 × 53,980.46
  4. Step 4: Simplify right side
    66,685.57x = 5,391,880,891.66
  5. Step 5: Solve for x
    x = 5,391,880,891.66/66,685.57
  6. Step 6: Final answer
    x = 80,855.29

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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.