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Finding the Fourth Proportional to 78,661.41, 108,552.21 and 42,851.45

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Solution

The fourth proportional to 78,661.41, 108,552.21 and 42,851.45 is: 59,134.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.41 : 108,552.21 = 42,851.45 : x
  2. Step 2: Convert to fraction form
    78,661.41/108,552.21 = 42,851.45/x
  3. Step 3: Cross multiply
    78,661.41x = 108,552.21 × 42,851.45
  4. Step 4: Simplify right side
    78,661.41x = 4,651,619,056.44
  5. Step 5: Solve for x
    x = 4,651,619,056.44/78,661.41
  6. Step 6: Final answer
    x = 59,134.70

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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.