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Finding the Fourth Proportional to 919,802.76, 1,269,239.82 and 678,215.76

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Solution

The fourth proportional to 919,802.76, 1,269,239.82 and 678,215.76 is: 935,872.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,802.76 : 1,269,239.82 = 678,215.76 : x
  2. Step 2: Convert to fraction form
    919,802.76/1,269,239.82 = 678,215.76/x
  3. Step 3: Cross multiply
    919,802.76x = 1,269,239.82 × 678,215.76
  4. Step 4: Simplify right side
    919,802.76x = 860,818,449,143.56
  5. Step 5: Solve for x
    x = 860,818,449,143.56/919,802.76
  6. Step 6: Final answer
    x = 935,872.87

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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.