Home / 128,740.23-177,651.72-72,140.67

Finding the Fourth Proportional to 128,740.23, 177,651.72 and 72,140.67

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Solution

The fourth proportional to 128,740.23, 177,651.72 and 72,140.67 is: 99,548.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,740.23 : 177,651.72 = 72,140.67 : x
  2. Step 2: Convert to fraction form
    128,740.23/177,651.72 = 72,140.67/x
  3. Step 3: Cross multiply
    128,740.23x = 177,651.72 × 72,140.67
  4. Step 4: Simplify right side
    128,740.23x = 12,815,914,107.45
  5. Step 5: Solve for x
    x = 12,815,914,107.45/128,740.23
  6. Step 6: Final answer
    x = 99,548.63

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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.