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Finding the Fourth Proportional to 399,371, 551,132.93 and 218,083.28

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Solution

The fourth proportional to 399,371, 551,132.93 and 218,083.28 is: 300,955.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,371 : 551,132.93 = 218,083.28 : x
  2. Step 2: Convert to fraction form
    399,371/551,132.93 = 218,083.28/x
  3. Step 3: Cross multiply
    399,371x = 551,132.93 × 218,083.28
  4. Step 4: Simplify right side
    399,371x = 120,192,877,090.41
  5. Step 5: Solve for x
    x = 120,192,877,090.41/399,371
  6. Step 6: Final answer
    x = 300,955.45

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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.