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Finding the Fourth Proportional to 685.48, 1,028.76 and 361.48

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Solution

The fourth proportional to 685.48, 1,028.76 and 361.48 is: 542.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.48 : 1,028.76 = 361.48 : x
  2. Step 2: Convert to fraction form
    685.48/1,028.76 = 361.48/x
  3. Step 3: Cross multiply
    685.48x = 1,028.76 × 361.48
  4. Step 4: Simplify right side
    685.48x = 371,876.16
  5. Step 5: Solve for x
    x = 371,876.16/685.48
  6. Step 6: Final answer
    x = 542.50

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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.