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Finding the Fourth Proportional to 453.80, 626.28 and 388.28

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Solution

The fourth proportional to 453.80, 626.28 and 388.28 is: 535.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.80 : 626.28 = 388.28 : x
  2. Step 2: Convert to fraction form
    453.80/626.28 = 388.28/x
  3. Step 3: Cross multiply
    453.80x = 626.28 × 388.28
  4. Step 4: Simplify right side
    453.80x = 243,172.00
  5. Step 5: Solve for x
    x = 243,172.00/453.80
  6. Step 6: Final answer
    x = 535.86

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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.