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Finding the Fourth Proportional to 1,381.12, 2,071.92 and 697.12

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Solution

The fourth proportional to 1,381.12, 2,071.92 and 697.12 is: 1,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.12 : 2,071.92 = 697.12 : x
  2. Step 2: Convert to fraction form
    1,381.12/2,071.92 = 697.12/x
  3. Step 3: Cross multiply
    1,381.12x = 2,071.92 × 697.12
  4. Step 4: Simplify right side
    1,381.12x = 1,444,376.87
  5. Step 5: Solve for x
    x = 1,444,376.87/1,381.12
  6. Step 6: Final answer
    x = 1,045.80

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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.