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Finding the Fourth Proportional to 996.18, 1,373.08 and 715.96

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Solution

The fourth proportional to 996.18, 1,373.08 and 715.96 is: 986.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.18 : 1,373.08 = 715.96 : x
  2. Step 2: Convert to fraction form
    996.18/1,373.08 = 715.96/x
  3. Step 3: Cross multiply
    996.18x = 1,373.08 × 715.96
  4. Step 4: Simplify right side
    996.18x = 983,070.36
  5. Step 5: Solve for x
    x = 983,070.36/996.18
  6. Step 6: Final answer
    x = 986.84

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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.