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Finding the Fourth Proportional to 139,057.58, 191,898.28 and 78,640.08

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Solution

The fourth proportional to 139,057.58, 191,898.28 and 78,640.08 is: 108,522.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,057.58 : 191,898.28 = 78,640.08 : x
  2. Step 2: Convert to fraction form
    139,057.58/191,898.28 = 78,640.08/x
  3. Step 3: Cross multiply
    139,057.58x = 191,898.28 × 78,640.08
  4. Step 4: Simplify right side
    139,057.58x = 15,090,896,091.06
  5. Step 5: Solve for x
    x = 15,090,896,091.06/139,057.58
  6. Step 6: Final answer
    x = 108,522.64

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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.