Home / 138,640.04-191,332.11-78,188.62

Finding the Fourth Proportional to 138,640.04, 191,332.11 and 78,188.62

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Solution

The fourth proportional to 138,640.04, 191,332.11 and 78,188.62 is: 107,905.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,640.04 : 191,332.11 = 78,188.62 : x
  2. Step 2: Convert to fraction form
    138,640.04/191,332.11 = 78,188.62/x
  3. Step 3: Cross multiply
    138,640.04x = 191,332.11 × 78,188.62
  4. Step 4: Simplify right side
    138,640.04x = 14,959,994,023.18
  5. Step 5: Solve for x
    x = 14,959,994,023.18/138,640.04
  6. Step 6: Final answer
    x = 107,905.30

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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.