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Finding the Fourth Proportional to 279,087.78, 385,139.16 and 151,763.40

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Solution

The fourth proportional to 279,087.78, 385,139.16 and 151,763.40 is: 209,432.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,087.78 : 385,139.16 = 151,763.40 : x
  2. Step 2: Convert to fraction form
    279,087.78/385,139.16 = 151,763.40/x
  3. Step 3: Cross multiply
    279,087.78x = 385,139.16 × 151,763.40
  4. Step 4: Simplify right side
    279,087.78x = 58,450,028,394.74
  5. Step 5: Solve for x
    x = 58,450,028,394.74/279,087.78
  6. Step 6: Final answer
    x = 209,432.42

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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.