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Finding the Fourth Proportional to 1,328.25, 1,992.70 and 416.25

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Solution

The fourth proportional to 1,328.25, 1,992.70 and 416.25 is: 624.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.25 : 1,992.70 = 416.25 : x
  2. Step 2: Convert to fraction form
    1,328.25/1,992.70 = 416.25/x
  3. Step 3: Cross multiply
    1,328.25x = 1,992.70 × 416.25
  4. Step 4: Simplify right side
    1,328.25x = 829,459.29
  5. Step 5: Solve for x
    x = 829,459.29/1,328.25
  6. Step 6: Final answer
    x = 624.48

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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.