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Finding the Fourth Proportional to 279,145.78, 385,210.11 and 151,821.34

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Solution

The fourth proportional to 279,145.78, 385,210.11 and 151,821.34 is: 209,507.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,145.78 : 385,210.11 = 151,821.34 : x
  2. Step 2: Convert to fraction form
    279,145.78/385,210.11 = 151,821.34/x
  3. Step 3: Cross multiply
    279,145.78x = 385,210.11 × 151,821.34
  4. Step 4: Simplify right side
    279,145.78x = 58,483,115,081.75
  5. Step 5: Solve for x
    x = 58,483,115,081.75/279,145.78
  6. Step 6: Final answer
    x = 209,507.43

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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.