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Finding the Fourth Proportional to 408,904.40, 613,356.60 and 128,421.20

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Solution

The fourth proportional to 408,904.40, 613,356.60 and 128,421.20 is: 192,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,904.40 : 613,356.60 = 128,421.20 : x
  2. Step 2: Convert to fraction form
    408,904.40/613,356.60 = 128,421.20/x
  3. Step 3: Cross multiply
    408,904.40x = 613,356.60 × 128,421.20
  4. Step 4: Simplify right side
    408,904.40x = 78,767,990,599.92
  5. Step 5: Solve for x
    x = 78,767,990,599.92/408,904.40
  6. Step 6: Final answer
    x = 192,631.80

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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.