Home / 128,742.23-177,654.48-72,142.67

Finding the Fourth Proportional to 128,742.23, 177,654.48 and 72,142.67

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Solution

The fourth proportional to 128,742.23, 177,654.48 and 72,142.67 is: 99,551.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,742.23 : 177,654.48 = 72,142.67 : x
  2. Step 2: Convert to fraction form
    128,742.23/177,654.48 = 72,142.67/x
  3. Step 3: Cross multiply
    128,742.23x = 177,654.48 × 72,142.67
  4. Step 4: Simplify right side
    128,742.23x = 12,816,468,524.66
  5. Step 5: Solve for x
    x = 12,816,468,524.66/128,742.23
  6. Step 6: Final answer
    x = 99,551.39

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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.