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Finding the Fourth Proportional to 678,750.76, 1,018,555.28 and 379,427.80

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Solution

The fourth proportional to 678,750.76, 1,018,555.28 and 379,427.80 is: 569,381.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,750.76 : 1,018,555.28 = 379,427.80 : x
  2. Step 2: Convert to fraction form
    678,750.76/1,018,555.28 = 379,427.80/x
  3. Step 3: Cross multiply
    678,750.76x = 1,018,555.28 × 379,427.80
  4. Step 4: Simplify right side
    678,750.76x = 386,468,189,068.78
  5. Step 5: Solve for x
    x = 386,468,189,068.78/678,750.76
  6. Step 6: Final answer
    x = 569,381.59

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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.