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Finding the Fourth Proportional to 66,035.79, 91,112.85 and 39,177

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Solution

The fourth proportional to 66,035.79, 91,112.85 and 39,177 is: 54,054.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,035.79 : 91,112.85 = 39,177 : x
  2. Step 2: Convert to fraction form
    66,035.79/91,112.85 = 39,177/x
  3. Step 3: Cross multiply
    66,035.79x = 91,112.85 × 39,177
  4. Step 4: Simplify right side
    66,035.79x = 3,569,528,124.45
  5. Step 5: Solve for x
    x = 3,569,528,124.45/66,035.79
  6. Step 6: Final answer
    x = 54,054.45

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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.