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Finding the Fourth Proportional to 685.84, 1,030.38 and 397.48

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Solution

The fourth proportional to 685.84, 1,030.38 and 397.48 is: 597.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.84 : 1,030.38 = 397.48 : x
  2. Step 2: Convert to fraction form
    685.84/1,030.38 = 397.48/x
  3. Step 3: Cross multiply
    685.84x = 1,030.38 × 397.48
  4. Step 4: Simplify right side
    685.84x = 409,555.44
  5. Step 5: Solve for x
    x = 409,555.44/685.84
  6. Step 6: Final answer
    x = 597.16

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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.