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Finding the Fourth Proportional to 279,406.89, 385,655.67 and 172,066.86

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Solution

The fourth proportional to 279,406.89, 385,655.67 and 172,066.86 is: 237,497.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,406.89 : 385,655.67 = 172,066.86 : x
  2. Step 2: Convert to fraction form
    279,406.89/385,655.67 = 172,066.86/x
  3. Step 3: Cross multiply
    279,406.89x = 385,655.67 × 172,066.86
  4. Step 4: Simplify right side
    279,406.89x = 66,358,560,178.10
  5. Step 5: Solve for x
    x = 66,358,560,178.10/279,406.89
  6. Step 6: Final answer
    x = 237,497.94

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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.