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Finding the Fourth Proportional to 992.64, 1,486.29 and 644.97

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Solution

The fourth proportional to 992.64, 1,486.29 and 644.97 is: 965.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.64 : 1,486.29 = 644.97 : x
  2. Step 2: Convert to fraction form
    992.64/1,486.29 = 644.97/x
  3. Step 3: Cross multiply
    992.64x = 1,486.29 × 644.97
  4. Step 4: Simplify right side
    992.64x = 958,612.46
  5. Step 5: Solve for x
    x = 958,612.46/992.64
  6. Step 6: Final answer
    x = 965.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.