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Finding the Fourth Proportional to 685.69, 946.26 and 486.88

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Solution

The fourth proportional to 685.69, 946.26 and 486.88 is: 671.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.69 : 946.26 = 486.88 : x
  2. Step 2: Convert to fraction form
    685.69/946.26 = 486.88/x
  3. Step 3: Cross multiply
    685.69x = 946.26 × 486.88
  4. Step 4: Simplify right side
    685.69x = 460,712.70
  5. Step 5: Solve for x
    x = 460,712.70/685.69
  6. Step 6: Final answer
    x = 671.90

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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.