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Finding the Fourth Proportional to 408,778.08, 613,166 and 128,316.32

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Solution

The fourth proportional to 408,778.08, 613,166 and 128,316.32 is: 192,474.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,778.08 : 613,166 = 128,316.32 : x
  2. Step 2: Convert to fraction form
    408,778.08/613,166 = 128,316.32/x
  3. Step 3: Cross multiply
    408,778.08x = 613,166 × 128,316.32
  4. Step 4: Simplify right side
    408,778.08x = 78,679,204,669.12
  5. Step 5: Solve for x
    x = 78,679,204,669.12/408,778.08
  6. Step 6: Final answer
    x = 192,474.13

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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.