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Finding the Fourth Proportional to 66,381.51, 91,696.01 and 61,657.59

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Solution

The fourth proportional to 66,381.51, 91,696.01 and 61,657.59 is: 85,170.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,381.51 : 91,696.01 = 61,657.59 : x
  2. Step 2: Convert to fraction form
    66,381.51/91,696.01 = 61,657.59/x
  3. Step 3: Cross multiply
    66,381.51x = 91,696.01 × 61,657.59
  4. Step 4: Simplify right side
    66,381.51x = 5,653,754,680.93
  5. Step 5: Solve for x
    x = 5,653,754,680.93/66,381.51
  6. Step 6: Final answer
    x = 85,170.62

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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.