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Finding the Fourth Proportional to 128,603.40, 177,472.52 and 72,015.20

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Solution

The fourth proportional to 128,603.40, 177,472.52 and 72,015.20 is: 99,380.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,603.40 : 177,472.52 = 72,015.20 : x
  2. Step 2: Convert to fraction form
    128,603.40/177,472.52 = 72,015.20/x
  3. Step 3: Cross multiply
    128,603.40x = 177,472.52 × 72,015.20
  4. Step 4: Simplify right side
    128,603.40x = 12,780,719,022.30
  5. Step 5: Solve for x
    x = 12,780,719,022.30/128,603.40
  6. Step 6: Final answer
    x = 99,380.88

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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.