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Finding the Fourth Proportional to 891.79, 1,229.74 and 644.29

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Solution

The fourth proportional to 891.79, 1,229.74 and 644.29 is: 888.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.79 : 1,229.74 = 644.29 : x
  2. Step 2: Convert to fraction form
    891.79/1,229.74 = 644.29/x
  3. Step 3: Cross multiply
    891.79x = 1,229.74 × 644.29
  4. Step 4: Simplify right side
    891.79x = 792,309.18
  5. Step 5: Solve for x
    x = 792,309.18/891.79
  6. Step 6: Final answer
    x = 888.45

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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.