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Finding the Fourth Proportional to 685.85, 944.76 and 489.02

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Solution

The fourth proportional to 685.85, 944.76 and 489.02 is: 673.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.85 : 944.76 = 489.02 : x
  2. Step 2: Convert to fraction form
    685.85/944.76 = 489.02/x
  3. Step 3: Cross multiply
    685.85x = 944.76 × 489.02
  4. Step 4: Simplify right side
    685.85x = 462,001.81
  5. Step 5: Solve for x
    x = 462,001.81/685.85
  6. Step 6: Final answer
    x = 673.62

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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.