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Finding the Fourth Proportional to 1,688.38, 2,529.09 and 992.93

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Solution

The fourth proportional to 1,688.38, 2,529.09 and 992.93 is: 1,487.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.38 : 2,529.09 = 992.93 : x
  2. Step 2: Convert to fraction form
    1,688.38/2,529.09 = 992.93/x
  3. Step 3: Cross multiply
    1,688.38x = 2,529.09 × 992.93
  4. Step 4: Simplify right side
    1,688.38x = 2,511,196.69
  5. Step 5: Solve for x
    x = 2,511,196.69/1,688.38
  6. Step 6: Final answer
    x = 1,487.34

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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.