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Finding the Fourth Proportional to 128,989.40, 193,046.70 and 128,989.40

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Solution

The fourth proportional to 128,989.40, 193,046.70 and 128,989.40 is: 193,046.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.40 : 193,046.70 = 128,989.40 : x
  2. Step 2: Convert to fraction form
    128,989.40/193,046.70 = 128,989.40/x
  3. Step 3: Cross multiply
    128,989.40x = 193,046.70 × 128,989.40
  4. Step 4: Simplify right side
    128,989.40x = 24,900,978,004.98
  5. Step 5: Solve for x
    x = 24,900,978,004.98/128,989.40
  6. Step 6: Final answer
    x = 193,046.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.