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Finding the Fourth Proportional to 78,661.74, 108,552.60 and 42,851.64

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Solution

The fourth proportional to 78,661.74, 108,552.60 and 42,851.64 is: 59,134.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.74 : 108,552.60 = 42,851.64 : x
  2. Step 2: Convert to fraction form
    78,661.74/108,552.60 = 42,851.64/x
  3. Step 3: Cross multiply
    78,661.74x = 108,552.60 × 42,851.64
  4. Step 4: Simplify right side
    78,661.74x = 4,651,656,936.26
  5. Step 5: Solve for x
    x = 4,651,656,936.26/78,661.74
  6. Step 6: Final answer
    x = 59,134.94

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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.