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Finding the Fourth Proportional to 66,246.40, 99,446.40 and 39,980.80

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Solution

The fourth proportional to 66,246.40, 99,446.40 and 39,980.80 is: 60,017.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,246.40 : 99,446.40 = 39,980.80 : x
  2. Step 2: Convert to fraction form
    66,246.40/99,446.40 = 39,980.80/x
  3. Step 3: Cross multiply
    66,246.40x = 99,446.40 × 39,980.80
  4. Step 4: Simplify right side
    66,246.40x = 3,975,946,629.12
  5. Step 5: Solve for x
    x = 3,975,946,629.12/66,246.40
  6. Step 6: Final answer
    x = 60,017.55

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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.