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Finding the Fourth Proportional to 896.86, 1,236.76 and 644.95

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Solution

The fourth proportional to 896.86, 1,236.76 and 644.95 is: 889.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.86 : 1,236.76 = 644.95 : x
  2. Step 2: Convert to fraction form
    896.86/1,236.76 = 644.95/x
  3. Step 3: Cross multiply
    896.86x = 1,236.76 × 644.95
  4. Step 4: Simplify right side
    896.86x = 797,648.36
  5. Step 5: Solve for x
    x = 797,648.36/896.86
  6. Step 6: Final answer
    x = 889.38

Related Problems

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Half scale
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Double scale
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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.