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Finding the Fourth Proportional to 637.28, 879.24 and 388.76

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Solution

The fourth proportional to 637.28, 879.24 and 388.76 is: 536.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.28 : 879.24 = 388.76 : x
  2. Step 2: Convert to fraction form
    637.28/879.24 = 388.76/x
  3. Step 3: Cross multiply
    637.28x = 879.24 × 388.76
  4. Step 4: Simplify right side
    637.28x = 341,813.34
  5. Step 5: Solve for x
    x = 341,813.34/637.28
  6. Step 6: Final answer
    x = 536.36

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1.5x scale

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.