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Finding the Fourth Proportional to 117,903.86, 162,815.39 and 74,897.21

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Solution

The fourth proportional to 117,903.86, 162,815.39 and 74,897.21 is: 103,426.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,903.86 : 162,815.39 = 74,897.21 : x
  2. Step 2: Convert to fraction form
    117,903.86/162,815.39 = 74,897.21/x
  3. Step 3: Cross multiply
    117,903.86x = 162,815.39 × 74,897.21
  4. Step 4: Simplify right side
    117,903.86x = 12,194,418,049.02
  5. Step 5: Solve for x
    x = 12,194,418,049.02/117,903.86
  6. Step 6: Final answer
    x = 103,426.80

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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.