Home / 128,766.75-177,697.47-72,178.12

Finding the Fourth Proportional to 128,766.75, 177,697.47 and 72,178.12

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Solution

The fourth proportional to 128,766.75, 177,697.47 and 72,178.12 is: 99,605.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,766.75 : 177,697.47 = 72,178.12 : x
  2. Step 2: Convert to fraction form
    128,766.75/177,697.47 = 72,178.12/x
  3. Step 3: Cross multiply
    128,766.75x = 177,697.47 × 72,178.12
  4. Step 4: Simplify right side
    128,766.75x = 12,825,869,313.36
  5. Step 5: Solve for x
    x = 12,825,869,313.36/128,766.75
  6. Step 6: Final answer
    x = 99,605.44

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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.