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Finding the Fourth Proportional to 938.98, 1,296.35 and 644.68

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Solution

The fourth proportional to 938.98, 1,296.35 and 644.68 is: 890.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.98 : 1,296.35 = 644.68 : x
  2. Step 2: Convert to fraction form
    938.98/1,296.35 = 644.68/x
  3. Step 3: Cross multiply
    938.98x = 1,296.35 × 644.68
  4. Step 4: Simplify right side
    938.98x = 835,730.92
  5. Step 5: Solve for x
    x = 835,730.92/938.98
  6. Step 6: Final answer
    x = 890.04

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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.