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Finding the Fourth Proportional to 399,340.51, 551,087.71 and 218,051.15

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Solution

The fourth proportional to 399,340.51, 551,087.71 and 218,051.15 is: 300,909.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,340.51 : 551,087.71 = 218,051.15 : x
  2. Step 2: Convert to fraction form
    399,340.51/551,087.71 = 218,051.15/x
  3. Step 3: Cross multiply
    399,340.51x = 551,087.71 × 218,051.15
  4. Step 4: Simplify right side
    399,340.51x = 120,165,309,643.95
  5. Step 5: Solve for x
    x = 120,165,309,643.95/399,340.51
  6. Step 6: Final answer
    x = 300,909.39

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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.