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Finding the Fourth Proportional to 279,081.90, 385,128.63 and 151,756.38

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Solution

The fourth proportional to 279,081.90, 385,128.63 and 151,756.38 is: 209,421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,081.90 : 385,128.63 = 151,756.38 : x
  2. Step 2: Convert to fraction form
    279,081.90/385,128.63 = 151,756.38/x
  3. Step 3: Cross multiply
    279,081.90x = 385,128.63 × 151,756.38
  4. Step 4: Simplify right side
    279,081.90x = 58,445,726,723.16
  5. Step 5: Solve for x
    x = 58,445,726,723.16/279,081.90
  6. Step 6: Final answer
    x = 209,421.42

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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.