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Finding the Fourth Proportional to 685.51, 945.57 and 423.25

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Solution

The fourth proportional to 685.51, 945.57 and 423.25 is: 583.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.51 : 945.57 = 423.25 : x
  2. Step 2: Convert to fraction form
    685.51/945.57 = 423.25/x
  3. Step 3: Cross multiply
    685.51x = 945.57 × 423.25
  4. Step 4: Simplify right side
    685.51x = 400,212.50
  5. Step 5: Solve for x
    x = 400,212.50/685.51
  6. Step 6: Final answer
    x = 583.82

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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.