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Finding the Fourth Proportional to 398,618.47, 550,093.32 and 217,330.54

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Solution

The fourth proportional to 398,618.47, 550,093.32 and 217,330.54 is: 299,916.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,618.47 : 550,093.32 = 217,330.54 : x
  2. Step 2: Convert to fraction form
    398,618.47/550,093.32 = 217,330.54/x
  3. Step 3: Cross multiply
    398,618.47x = 550,093.32 × 217,330.54
  4. Step 4: Simplify right side
    398,618.47x = 119,552,080,204.55
  5. Step 5: Solve for x
    x = 119,552,080,204.55/398,618.47
  6. Step 6: Final answer
    x = 299,916.06

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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.