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Finding the Fourth Proportional to 398,728.39, 550,258.38 and 217,455.25

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Solution

The fourth proportional to 398,728.39, 550,258.38 and 217,455.25 is: 300,095.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,728.39 : 550,258.38 = 217,455.25 : x
  2. Step 2: Convert to fraction form
    398,728.39/550,258.38 = 217,455.25/x
  3. Step 3: Cross multiply
    398,728.39x = 550,258.38 × 217,455.25
  4. Step 4: Simplify right side
    398,728.39x = 119,656,573,587.50
  5. Step 5: Solve for x
    x = 119,656,573,587.50/398,728.39
  6. Step 6: Final answer
    x = 300,095.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.