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Finding the Fourth Proportional to 665,679.12, 918,531 and 379,204.80

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Solution

The fourth proportional to 665,679.12, 918,531 and 379,204.80 is: 523,242.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,679.12 : 918,531 = 379,204.80 : x
  2. Step 2: Convert to fraction form
    665,679.12/918,531 = 379,204.80/x
  3. Step 3: Cross multiply
    665,679.12x = 918,531 × 379,204.80
  4. Step 4: Simplify right side
    665,679.12x = 348,311,364,148.80
  5. Step 5: Solve for x
    x = 348,311,364,148.80/665,679.12
  6. Step 6: Final answer
    x = 523,242.14

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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.