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Finding the Fourth Proportional to 1,421.64, 1,962 and 897.84

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Solution

The fourth proportional to 1,421.64, 1,962 and 897.84 is: 1,239.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.64 : 1,962 = 897.84 : x
  2. Step 2: Convert to fraction form
    1,421.64/1,962 = 897.84/x
  3. Step 3: Cross multiply
    1,421.64x = 1,962 × 897.84
  4. Step 4: Simplify right side
    1,421.64x = 1,761,562.08
  5. Step 5: Solve for x
    x = 1,761,562.08/1,421.64
  6. Step 6: Final answer
    x = 1,239.11

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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.