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Finding the Fourth Proportional to 1,396.85, 1,926.96 and 977.04

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Solution

The fourth proportional to 1,396.85, 1,926.96 and 977.04 is: 1,347.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.85 : 1,926.96 = 977.04 : x
  2. Step 2: Convert to fraction form
    1,396.85/1,926.96 = 977.04/x
  3. Step 3: Cross multiply
    1,396.85x = 1,926.96 × 977.04
  4. Step 4: Simplify right side
    1,396.85x = 1,882,717.00
  5. Step 5: Solve for x
    x = 1,882,717.00/1,396.85
  6. Step 6: Final answer
    x = 1,347.84

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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.