Home / 137,021.31-189,113.49-79,678.38

Finding the Fourth Proportional to 137,021.31, 189,113.49 and 79,678.38

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Solution

The fourth proportional to 137,021.31, 189,113.49 and 79,678.38 is: 109,970.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,021.31 : 189,113.49 = 79,678.38 : x
  2. Step 2: Convert to fraction form
    137,021.31/189,113.49 = 79,678.38/x
  3. Step 3: Cross multiply
    137,021.31x = 189,113.49 × 79,678.38
  4. Step 4: Simplify right side
    137,021.31x = 15,068,256,519.35
  5. Step 5: Solve for x
    x = 15,068,256,519.35/137,021.31
  6. Step 6: Final answer
    x = 109,970.17

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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.