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Finding the Fourth Proportional to 723.84, 998.25 and 644.19

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Solution

The fourth proportional to 723.84, 998.25 and 644.19 is: 888.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.84 : 998.25 = 644.19 : x
  2. Step 2: Convert to fraction form
    723.84/998.25 = 644.19/x
  3. Step 3: Cross multiply
    723.84x = 998.25 × 644.19
  4. Step 4: Simplify right side
    723.84x = 643,062.67
  5. Step 5: Solve for x
    x = 643,062.67/723.84
  6. Step 6: Final answer
    x = 888.40

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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.