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Finding the Fourth Proportional to 685.99, 1,028.96 and 275.01

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Solution

The fourth proportional to 685.99, 1,028.96 and 275.01 is: 412.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.99 : 1,028.96 = 275.01 : x
  2. Step 2: Convert to fraction form
    685.99/1,028.96 = 275.01/x
  3. Step 3: Cross multiply
    685.99x = 1,028.96 × 275.01
  4. Step 4: Simplify right side
    685.99x = 282,974.29
  5. Step 5: Solve for x
    x = 282,974.29/685.99
  6. Step 6: Final answer
    x = 412.51

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1.5x scale

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.