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Finding the Fourth Proportional to 128,247.76, 176,890.12 and 90,015.84

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Solution

The fourth proportional to 128,247.76, 176,890.12 and 90,015.84 is: 124,157.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,247.76 : 176,890.12 = 90,015.84 : x
  2. Step 2: Convert to fraction form
    128,247.76/176,890.12 = 90,015.84/x
  3. Step 3: Cross multiply
    128,247.76x = 176,890.12 × 90,015.84
  4. Step 4: Simplify right side
    128,247.76x = 15,922,912,739.50
  5. Step 5: Solve for x
    x = 15,922,912,739.50/128,247.76
  6. Step 6: Final answer
    x = 124,157.43

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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.