Home / 138,737.16-191,457.92-78,310.36

Finding the Fourth Proportional to 138,737.16, 191,457.92 and 78,310.36

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Solution

The fourth proportional to 138,737.16, 191,457.92 and 78,310.36 is: 108,068.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,737.16 : 191,457.92 = 78,310.36 : x
  2. Step 2: Convert to fraction form
    138,737.16/191,457.92 = 78,310.36/x
  3. Step 3: Cross multiply
    138,737.16x = 191,457.92 × 78,310.36
  4. Step 4: Simplify right side
    138,737.16x = 14,993,138,640.05
  5. Step 5: Solve for x
    x = 14,993,138,640.05/138,737.16
  6. Step 6: Final answer
    x = 108,068.66

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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.