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Finding the Fourth Proportional to 685.89, 945.54 and 645.75

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Solution

The fourth proportional to 685.89, 945.54 and 645.75 is: 890.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.89 : 945.54 = 645.75 : x
  2. Step 2: Convert to fraction form
    685.89/945.54 = 645.75/x
  3. Step 3: Cross multiply
    685.89x = 945.54 × 645.75
  4. Step 4: Simplify right side
    685.89x = 610,582.46
  5. Step 5: Solve for x
    x = 610,582.46/685.89
  6. Step 6: Final answer
    x = 890.20

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Double scale
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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.