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Finding the Fourth Proportional to 685.08, 945.40 and 374.58

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Solution

The fourth proportional to 685.08, 945.40 and 374.58 is: 516.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.08 : 945.40 = 374.58 : x
  2. Step 2: Convert to fraction form
    685.08/945.40 = 374.58/x
  3. Step 3: Cross multiply
    685.08x = 945.40 × 374.58
  4. Step 4: Simplify right side
    685.08x = 354,127.93
  5. Step 5: Solve for x
    x = 354,127.93/685.08
  6. Step 6: Final answer
    x = 516.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.