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Finding the Fourth Proportional to 1,128.43, 1,688.09 and 976.05

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Solution

The fourth proportional to 1,128.43, 1,688.09 and 976.05 is: 1,460.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.43 : 1,688.09 = 976.05 : x
  2. Step 2: Convert to fraction form
    1,128.43/1,688.09 = 976.05/x
  3. Step 3: Cross multiply
    1,128.43x = 1,688.09 × 976.05
  4. Step 4: Simplify right side
    1,128.43x = 1,647,655.36
  5. Step 5: Solve for x
    x = 1,647,655.36/1,128.43
  6. Step 6: Final answer
    x = 1,460.13

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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.