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Finding the Fourth Proportional to 994.48, 1,374.14 and 715.63

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Solution

The fourth proportional to 994.48, 1,374.14 and 715.63 is: 988.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.48 : 1,374.14 = 715.63 : x
  2. Step 2: Convert to fraction form
    994.48/1,374.14 = 715.63/x
  3. Step 3: Cross multiply
    994.48x = 1,374.14 × 715.63
  4. Step 4: Simplify right side
    994.48x = 983,375.81
  5. Step 5: Solve for x
    x = 983,375.81/994.48
  6. Step 6: Final answer
    x = 988.83

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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.