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Finding the Fourth Proportional to 808.32, 1,116.40 and 644.32

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Solution

The fourth proportional to 808.32, 1,116.40 and 644.32 is: 889.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.32 : 1,116.40 = 644.32 : x
  2. Step 2: Convert to fraction form
    808.32/1,116.40 = 644.32/x
  3. Step 3: Cross multiply
    808.32x = 1,116.40 × 644.32
  4. Step 4: Simplify right side
    808.32x = 719,318.85
  5. Step 5: Solve for x
    x = 719,318.85/808.32
  6. Step 6: Final answer
    x = 889.89

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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.