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Finding the Fourth Proportional to 66,785.78, 91,978.53 and 51,622.58

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Solution

The fourth proportional to 66,785.78, 91,978.53 and 51,622.58 is: 71,095.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,785.78 : 91,978.53 = 51,622.58 : x
  2. Step 2: Convert to fraction form
    66,785.78/91,978.53 = 51,622.58/x
  3. Step 3: Cross multiply
    66,785.78x = 91,978.53 × 51,622.58
  4. Step 4: Simplify right side
    66,785.78x = 4,748,169,023.21
  5. Step 5: Solve for x
    x = 4,748,169,023.21/66,785.78
  6. Step 6: Final answer
    x = 71,095.51

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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.