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Finding the Fourth Proportional to 993, 1,368.90 and 697.80

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Solution

The fourth proportional to 993, 1,368.90 and 697.80 is: 961.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    993 : 1,368.90 = 697.80 : x
  2. Step 2: Convert to fraction form
    993/1,368.90 = 697.80/x
  3. Step 3: Cross multiply
    993x = 1,368.90 × 697.80
  4. Step 4: Simplify right side
    993x = 955,218.42
  5. Step 5: Solve for x
    x = 955,218.42/993
  6. Step 6: Final answer
    x = 961.95

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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.