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Finding the Fourth Proportional to 408,889.16, 613,432.56 and 128,406.40

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Solution

The fourth proportional to 408,889.16, 613,432.56 and 128,406.40 is: 192,640.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,889.16 : 613,432.56 = 128,406.40 : x
  2. Step 2: Convert to fraction form
    408,889.16/613,432.56 = 128,406.40/x
  3. Step 3: Cross multiply
    408,889.16x = 613,432.56 × 128,406.40
  4. Step 4: Simplify right side
    408,889.16x = 78,768,666,672.38
  5. Step 5: Solve for x
    x = 78,768,666,672.38/408,889.16
  6. Step 6: Final answer
    x = 192,640.63

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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.