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Finding the Fourth Proportional to 66,420.90, 91,659.65 and 36,206.48

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Solution

The fourth proportional to 66,420.90, 91,659.65 and 36,206.48 is: 49,964.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.90 : 91,659.65 = 36,206.48 : x
  2. Step 2: Convert to fraction form
    66,420.90/91,659.65 = 36,206.48/x
  3. Step 3: Cross multiply
    66,420.90x = 91,659.65 × 36,206.48
  4. Step 4: Simplify right side
    66,420.90x = 3,318,673,284.53
  5. Step 5: Solve for x
    x = 3,318,673,284.53/66,420.90
  6. Step 6: Final answer
    x = 49,964.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.