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Finding the Fourth Proportional to 665,978.22, 919,060.02 and 379,492.20

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Solution

The fourth proportional to 665,978.22, 919,060.02 and 379,492.20 is: 523,704.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,978.22 : 919,060.02 = 379,492.20 : x
  2. Step 2: Convert to fraction form
    665,978.22/919,060.02 = 379,492.20/x
  3. Step 3: Cross multiply
    665,978.22x = 919,060.02 × 379,492.20
  4. Step 4: Simplify right side
    665,978.22x = 348,776,108,921.84
  5. Step 5: Solve for x
    x = 348,776,108,921.84/665,978.22
  6. Step 6: Final answer
    x = 523,704.98

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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.