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Finding the Fourth Proportional to 77,889.40, 107,487.34 and 42,079.44

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Solution

The fourth proportional to 77,889.40, 107,487.34 and 42,079.44 is: 58,069.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,889.40 : 107,487.34 = 42,079.44 : x
  2. Step 2: Convert to fraction form
    77,889.40/107,487.34 = 42,079.44/x
  3. Step 3: Cross multiply
    77,889.40x = 107,487.34 × 42,079.44
  4. Step 4: Simplify right side
    77,889.40x = 4,523,007,074.29
  5. Step 5: Solve for x
    x = 4,523,007,074.29/77,889.40
  6. Step 6: Final answer
    x = 58,069.61

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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.