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Finding the Fourth Proportional to 614.78, 848.16 and 378.80

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Solution

The fourth proportional to 614.78, 848.16 and 378.80 is: 522.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.78 : 848.16 = 378.80 : x
  2. Step 2: Convert to fraction form
    614.78/848.16 = 378.80/x
  3. Step 3: Cross multiply
    614.78x = 848.16 × 378.80
  4. Step 4: Simplify right side
    614.78x = 321,283.01
  5. Step 5: Solve for x
    x = 321,283.01/614.78
  6. Step 6: Final answer
    x = 522.60

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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.