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Finding the Fourth Proportional to 66,138.28, 91,220.80 and 45,985.07

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Solution

The fourth proportional to 66,138.28, 91,220.80 and 45,985.07 is: 63,424.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,138.28 : 91,220.80 = 45,985.07 : x
  2. Step 2: Convert to fraction form
    66,138.28/91,220.80 = 45,985.07/x
  3. Step 3: Cross multiply
    66,138.28x = 91,220.80 × 45,985.07
  4. Step 4: Simplify right side
    66,138.28x = 4,194,794,873.46
  5. Step 5: Solve for x
    x = 4,194,794,873.46/66,138.28
  6. Step 6: Final answer
    x = 63,424.61

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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.