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Finding the Fourth Proportional to 1,657.98, 2,485.35 and 684.78

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Solution

The fourth proportional to 1,657.98, 2,485.35 and 684.78 is: 1,026.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.98 : 2,485.35 = 684.78 : x
  2. Step 2: Convert to fraction form
    1,657.98/2,485.35 = 684.78/x
  3. Step 3: Cross multiply
    1,657.98x = 2,485.35 × 684.78
  4. Step 4: Simplify right side
    1,657.98x = 1,701,917.97
  5. Step 5: Solve for x
    x = 1,701,917.97/1,657.98
  6. Step 6: Final answer
    x = 1,026.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.