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Finding the Fourth Proportional to 399,172.18, 550,862.75 and 217,889.32

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Solution

The fourth proportional to 399,172.18, 550,862.75 and 217,889.32 is: 300,690.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,172.18 : 550,862.75 = 217,889.32 : x
  2. Step 2: Convert to fraction form
    399,172.18/550,862.75 = 217,889.32/x
  3. Step 3: Cross multiply
    399,172.18x = 550,862.75 × 217,889.32
  4. Step 4: Simplify right side
    399,172.18x = 120,027,110,010.83
  5. Step 5: Solve for x
    x = 120,027,110,010.83/399,172.18
  6. Step 6: Final answer
    x = 300,690.07

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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.