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Finding the Fourth Proportional to 622.40, 931.20 and 378.88

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Solution

The fourth proportional to 622.40, 931.20 and 378.88 is: 566.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.40 : 931.20 = 378.88 : x
  2. Step 2: Convert to fraction form
    622.40/931.20 = 378.88/x
  3. Step 3: Cross multiply
    622.40x = 931.20 × 378.88
  4. Step 4: Simplify right side
    622.40x = 352,813.06
  5. Step 5: Solve for x
    x = 352,813.06/622.40
  6. Step 6: Final answer
    x = 566.86

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1.5x scale

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.