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Finding the Fourth Proportional to 1,807.31, 2,494.40 and 1,021.21

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Solution

The fourth proportional to 1,807.31, 2,494.40 and 1,021.21 is: 1,409.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,807.31 : 2,494.40 = 1,021.21 : x
  2. Step 2: Convert to fraction form
    1,807.31/2,494.40 = 1,021.21/x
  3. Step 3: Cross multiply
    1,807.31x = 2,494.40 × 1,021.21
  4. Step 4: Simplify right side
    1,807.31x = 2,547,294.88
  5. Step 5: Solve for x
    x = 2,547,294.88/1,807.31
  6. Step 6: Final answer
    x = 1,409.44

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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.