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Finding the Fourth Proportional to 1,529.16, 2,109 and 938.64

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Solution

The fourth proportional to 1,529.16, 2,109 and 938.64 is: 1,294.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,529.16 : 2,109 = 938.64 : x
  2. Step 2: Convert to fraction form
    1,529.16/2,109 = 938.64/x
  3. Step 3: Cross multiply
    1,529.16x = 2,109 × 938.64
  4. Step 4: Simplify right side
    1,529.16x = 1,979,591.76
  5. Step 5: Solve for x
    x = 1,979,591.76/1,529.16
  6. Step 6: Final answer
    x = 1,294.56

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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.