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Finding the Fourth Proportional to 399,312.59, 551,053.02 and 218,028.51

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Solution

The fourth proportional to 399,312.59, 551,053.02 and 218,028.51 is: 300,880.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,312.59 : 551,053.02 = 218,028.51 : x
  2. Step 2: Convert to fraction form
    399,312.59/551,053.02 = 218,028.51/x
  3. Step 3: Cross multiply
    399,312.59x = 551,053.02 × 218,028.51
  4. Step 4: Simplify right side
    399,312.59x = 120,145,269,699.21
  5. Step 5: Solve for x
    x = 120,145,269,699.21/399,312.59
  6. Step 6: Final answer
    x = 300,880.25

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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.