Home / 138,619.76-191,336.18-81,271.54

Finding the Fourth Proportional to 138,619.76, 191,336.18 and 81,271.54

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Solution

The fourth proportional to 138,619.76, 191,336.18 and 81,271.54 is: 112,178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,619.76 : 191,336.18 = 81,271.54 : x
  2. Step 2: Convert to fraction form
    138,619.76/191,336.18 = 81,271.54/x
  3. Step 3: Cross multiply
    138,619.76x = 191,336.18 × 81,271.54
  4. Step 4: Simplify right side
    138,619.76x = 15,550,184,762.86
  5. Step 5: Solve for x
    x = 15,550,184,762.86/138,619.76
  6. Step 6: Final answer
    x = 112,178.70

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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.