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Finding the Fourth Proportional to 77,684.12, 107,212.31 and 47,487.12

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Solution

The fourth proportional to 77,684.12, 107,212.31 and 47,487.12 is: 65,537.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,684.12 : 107,212.31 = 47,487.12 : x
  2. Step 2: Convert to fraction form
    77,684.12/107,212.31 = 47,487.12/x
  3. Step 3: Cross multiply
    77,684.12x = 107,212.31 × 47,487.12
  4. Step 4: Simplify right side
    77,684.12x = 5,091,203,056.95
  5. Step 5: Solve for x
    x = 5,091,203,056.95/77,684.12
  6. Step 6: Final answer
    x = 65,537.25

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1.5x scale

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.