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Finding the Fourth Proportional to 399,341.52, 551,113.74 and 218,070.36

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Solution

The fourth proportional to 399,341.52, 551,113.74 and 218,070.36 is: 300,949.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,341.52 : 551,113.74 = 218,070.36 : x
  2. Step 2: Convert to fraction form
    399,341.52/551,113.74 = 218,070.36/x
  3. Step 3: Cross multiply
    399,341.52x = 551,113.74 × 218,070.36
  4. Step 4: Simplify right side
    399,341.52x = 120,181,571,682.75
  5. Step 5: Solve for x
    x = 120,181,571,682.75/399,341.52
  6. Step 6: Final answer
    x = 300,949.35

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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.