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Finding the Fourth Proportional to 66,570.72, 91,874.40 and 64,505.76

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Solution

The fourth proportional to 66,570.72, 91,874.40 and 64,505.76 is: 89,024.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,570.72 : 91,874.40 = 64,505.76 : x
  2. Step 2: Convert to fraction form
    66,570.72/91,874.40 = 64,505.76/x
  3. Step 3: Cross multiply
    66,570.72x = 91,874.40 × 64,505.76
  4. Step 4: Simplify right side
    66,570.72x = 5,926,427,996.54
  5. Step 5: Solve for x
    x = 5,926,427,996.54/66,570.72
  6. Step 6: Final answer
    x = 89,024.54

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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.