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Finding the Fourth Proportional to 78,689.58, 118,071.21 and 39,249.73

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Solution

The fourth proportional to 78,689.58, 118,071.21 and 39,249.73 is: 58,892.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,689.58 : 118,071.21 = 39,249.73 : x
  2. Step 2: Convert to fraction form
    78,689.58/118,071.21 = 39,249.73/x
  3. Step 3: Cross multiply
    78,689.58x = 118,071.21 × 39,249.73
  4. Step 4: Simplify right side
    78,689.58x = 4,634,263,113.27
  5. Step 5: Solve for x
    x = 4,634,263,113.27/78,689.58
  6. Step 6: Final answer
    x = 58,892.97

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1.5x scale

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.