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Finding the Fourth Proportional to 645.92, 891.70 and 437.20

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Solution

The fourth proportional to 645.92, 891.70 and 437.20 is: 603.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.92 : 891.70 = 437.20 : x
  2. Step 2: Convert to fraction form
    645.92/891.70 = 437.20/x
  3. Step 3: Cross multiply
    645.92x = 891.70 × 437.20
  4. Step 4: Simplify right side
    645.92x = 389,847.92
  5. Step 5: Solve for x
    x = 389,847.92/645.92
  6. Step 6: Final answer
    x = 603.56

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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.