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Finding the Fourth Proportional to 1,684.76, 2,325.09 and 938.72

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Solution

The fourth proportional to 1,684.76, 2,325.09 and 938.72 is: 1,295.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,684.76 : 2,325.09 = 938.72 : x
  2. Step 2: Convert to fraction form
    1,684.76/2,325.09 = 938.72/x
  3. Step 3: Cross multiply
    1,684.76x = 2,325.09 × 938.72
  4. Step 4: Simplify right side
    1,684.76x = 2,182,608.48
  5. Step 5: Solve for x
    x = 2,182,608.48/1,684.76
  6. Step 6: Final answer
    x = 1,295.50

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Half scale
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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.