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Finding the Fourth Proportional to 685.50, 945.03 and 489.46

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Solution

The fourth proportional to 685.50, 945.03 and 489.46 is: 674.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.50 : 945.03 = 489.46 : x
  2. Step 2: Convert to fraction form
    685.50/945.03 = 489.46/x
  3. Step 3: Cross multiply
    685.50x = 945.03 × 489.46
  4. Step 4: Simplify right side
    685.50x = 462,554.38
  5. Step 5: Solve for x
    x = 462,554.38/685.50
  6. Step 6: Final answer
    x = 674.77

Related Problems

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Half scale
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Double scale
Find fourth proportional to 686.50, 946.41 and 490.46
Similar ratio
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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.