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Finding the Fourth Proportional to 70,900.78, 106,351.32 and 66,570.52

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Solution

The fourth proportional to 70,900.78, 106,351.32 and 66,570.52 is: 99,855.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,900.78 : 106,351.32 = 66,570.52 : x
  2. Step 2: Convert to fraction form
    70,900.78/106,351.32 = 66,570.52/x
  3. Step 3: Cross multiply
    70,900.78x = 106,351.32 × 66,570.52
  4. Step 4: Simplify right side
    70,900.78x = 7,079,862,675.09
  5. Step 5: Solve for x
    x = 7,079,862,675.09/70,900.78
  6. Step 6: Final answer
    x = 99,855.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.