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Finding the Fourth Proportional to 279,142.98, 418,714.70 and 68,780.94

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Solution

The fourth proportional to 279,142.98, 418,714.70 and 68,780.94 is: 103,171.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,142.98 : 418,714.70 = 68,780.94 : x
  2. Step 2: Convert to fraction form
    279,142.98/418,714.70 = 68,780.94/x
  3. Step 3: Cross multiply
    279,142.98x = 418,714.70 × 68,780.94
  4. Step 4: Simplify right side
    279,142.98x = 28,799,590,313.91
  5. Step 5: Solve for x
    x = 28,799,590,313.91/279,142.98
  6. Step 6: Final answer
    x = 103,171.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.