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Finding the Fourth Proportional to 399,368, 551,128.79 and 218,080.28

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Solution

The fourth proportional to 399,368, 551,128.79 and 218,080.28 is: 300,951.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,368 : 551,128.79 = 218,080.28 : x
  2. Step 2: Convert to fraction form
    399,368/551,128.79 = 218,080.28/x
  3. Step 3: Cross multiply
    399,368x = 551,128.79 × 218,080.28
  4. Step 4: Simplify right side
    399,368x = 120,190,320,839.26
  5. Step 5: Solve for x
    x = 120,190,320,839.26/399,368
  6. Step 6: Final answer
    x = 300,951.31

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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.