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Finding the Fourth Proportional to 614.85, 848.12 and 393.72

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Solution

The fourth proportional to 614.85, 848.12 and 393.72 is: 543.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.85 : 848.12 = 393.72 : x
  2. Step 2: Convert to fraction form
    614.85/848.12 = 393.72/x
  3. Step 3: Cross multiply
    614.85x = 848.12 × 393.72
  4. Step 4: Simplify right side
    614.85x = 333,915.60
  5. Step 5: Solve for x
    x = 333,915.60/614.85
  6. Step 6: Final answer
    x = 543.09

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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.