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Finding the Fourth Proportional to 135,459.54, 186,964.20 and 78,903.72

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Solution

The fourth proportional to 135,459.54, 186,964.20 and 78,903.72 is: 108,904.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,459.54 : 186,964.20 = 78,903.72 : x
  2. Step 2: Convert to fraction form
    135,459.54/186,964.20 = 78,903.72/x
  3. Step 3: Cross multiply
    135,459.54x = 186,964.20 × 78,903.72
  4. Step 4: Simplify right side
    135,459.54x = 14,752,170,886.82
  5. Step 5: Solve for x
    x = 14,752,170,886.82/135,459.54
  6. Step 6: Final answer
    x = 108,904.63

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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.