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Finding the Fourth Proportional to 139,044.24, 191,873.64 and 78,611.28

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Solution

The fourth proportional to 139,044.24, 191,873.64 and 78,611.28 is: 108,479.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,044.24 : 191,873.64 = 78,611.28 : x
  2. Step 2: Convert to fraction form
    139,044.24/191,873.64 = 78,611.28/x
  3. Step 3: Cross multiply
    139,044.24x = 191,873.64 × 78,611.28
  4. Step 4: Simplify right side
    139,044.24x = 15,083,432,438.66
  5. Step 5: Solve for x
    x = 15,083,432,438.66/139,044.24
  6. Step 6: Final answer
    x = 108,479.38

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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.