Home / 138,939.84-191,734.47-78,509.18

Finding the Fourth Proportional to 138,939.84, 191,734.47 and 78,509.18

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Solution

The fourth proportional to 138,939.84, 191,734.47 and 78,509.18 is: 108,341.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,939.84 : 191,734.47 = 78,509.18 : x
  2. Step 2: Convert to fraction form
    138,939.84/191,734.47 = 78,509.18/x
  3. Step 3: Cross multiply
    138,939.84x = 191,734.47 × 78,509.18
  4. Step 4: Simplify right side
    138,939.84x = 15,052,916,496.77
  5. Step 5: Solve for x
    x = 15,052,916,496.77/138,939.84
  6. Step 6: Final answer
    x = 108,341.25

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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.