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Finding the Fourth Proportional to 638.10, 879.58 and 533.54

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Solution

The fourth proportional to 638.10, 879.58 and 533.54 is: 735.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.10 : 879.58 = 533.54 : x
  2. Step 2: Convert to fraction form
    638.10/879.58 = 533.54/x
  3. Step 3: Cross multiply
    638.10x = 879.58 × 533.54
  4. Step 4: Simplify right side
    638.10x = 469,290.53
  5. Step 5: Solve for x
    x = 469,290.53/638.10
  6. Step 6: Final answer
    x = 735.45

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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.