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Finding the Fourth Proportional to 398,555.40, 597,949.56 and 128,677.20

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Solution

The fourth proportional to 398,555.40, 597,949.56 and 128,677.20 is: 193,053.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,555.40 : 597,949.56 = 128,677.20 : x
  2. Step 2: Convert to fraction form
    398,555.40/597,949.56 = 128,677.20/x
  3. Step 3: Cross multiply
    398,555.40x = 597,949.56 × 128,677.20
  4. Step 4: Simplify right side
    398,555.40x = 76,942,475,122.03
  5. Step 5: Solve for x
    x = 76,942,475,122.03/398,555.40
  6. Step 6: Final answer
    x = 193,053.40

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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.