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Finding the Fourth Proportional to 1,085.50, 1,628.25 and 401.50

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Solution

The fourth proportional to 1,085.50, 1,628.25 and 401.50 is: 602.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.50 : 1,628.25 = 401.50 : x
  2. Step 2: Convert to fraction form
    1,085.50/1,628.25 = 401.50/x
  3. Step 3: Cross multiply
    1,085.50x = 1,628.25 × 401.50
  4. Step 4: Simplify right side
    1,085.50x = 653,742.38
  5. Step 5: Solve for x
    x = 653,742.38/1,085.50
  6. Step 6: Final answer
    x = 602.25

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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.