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Finding the Fourth Proportional to 1,007.93, 1,511.28 and 921.99

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Solution

The fourth proportional to 1,007.93, 1,511.28 and 921.99 is: 1,382.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.93 : 1,511.28 = 921.99 : x
  2. Step 2: Convert to fraction form
    1,007.93/1,511.28 = 921.99/x
  3. Step 3: Cross multiply
    1,007.93x = 1,511.28 × 921.99
  4. Step 4: Simplify right side
    1,007.93x = 1,393,372.88
  5. Step 5: Solve for x
    x = 1,393,372.88/1,007.93
  6. Step 6: Final answer
    x = 1,382.41

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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.