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Finding the Fourth Proportional to 502,780.72, 693,840 and 276,440.80

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Solution

The fourth proportional to 502,780.72, 693,840 and 276,440.80 is: 381,489.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    502,780.72 : 693,840 = 276,440.80 : x
  2. Step 2: Convert to fraction form
    502,780.72/693,840 = 276,440.80/x
  3. Step 3: Cross multiply
    502,780.72x = 693,840 × 276,440.80
  4. Step 4: Simplify right side
    502,780.72x = 191,805,684,672
  5. Step 5: Solve for x
    x = 191,805,684,672/502,780.72
  6. Step 6: Final answer
    x = 381,489.74

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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.