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Finding the Fourth Proportional to 645.59, 890.24 and 383.55

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Solution

The fourth proportional to 645.59, 890.24 and 383.55 is: 528.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.59 : 890.24 = 383.55 : x
  2. Step 2: Convert to fraction form
    645.59/890.24 = 383.55/x
  3. Step 3: Cross multiply
    645.59x = 890.24 × 383.55
  4. Step 4: Simplify right side
    645.59x = 341,449.63
  5. Step 5: Solve for x
    x = 341,449.63/645.59
  6. Step 6: Final answer
    x = 528.90

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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.