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Finding the Fourth Proportional to 279,803.78, 386,129.28 and 152,479.40

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Solution

The fourth proportional to 279,803.78, 386,129.28 and 152,479.40 is: 210,421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,803.78 : 386,129.28 = 152,479.40 : x
  2. Step 2: Convert to fraction form
    279,803.78/386,129.28 = 152,479.40/x
  3. Step 3: Cross multiply
    279,803.78x = 386,129.28 × 152,479.40
  4. Step 4: Simplify right side
    279,803.78x = 58,876,760,936.83
  5. Step 5: Solve for x
    x = 58,876,760,936.83/279,803.78
  6. Step 6: Final answer
    x = 210,421.61

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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.