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Finding the Fourth Proportional to 86,961.60, 120,009.60 and 55,123.20

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Solution

The fourth proportional to 86,961.60, 120,009.60 and 55,123.20 is: 76,071.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,961.60 : 120,009.60 = 55,123.20 : x
  2. Step 2: Convert to fraction form
    86,961.60/120,009.60 = 55,123.20/x
  3. Step 3: Cross multiply
    86,961.60x = 120,009.60 × 55,123.20
  4. Step 4: Simplify right side
    86,961.60x = 6,615,313,182.72
  5. Step 5: Solve for x
    x = 6,615,313,182.72/86,961.60
  6. Step 6: Final answer
    x = 76,071.66

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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.