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Finding the Fourth Proportional to 1,071.68, 1,607.61 and 422.25

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Solution

The fourth proportional to 1,071.68, 1,607.61 and 422.25 is: 633.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.68 : 1,607.61 = 422.25 : x
  2. Step 2: Convert to fraction form
    1,071.68/1,607.61 = 422.25/x
  3. Step 3: Cross multiply
    1,071.68x = 1,607.61 × 422.25
  4. Step 4: Simplify right side
    1,071.68x = 678,813.32
  5. Step 5: Solve for x
    x = 678,813.32/1,071.68
  6. Step 6: Final answer
    x = 633.41

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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.