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Finding the Fourth Proportional to 1,403.10, 1,936.20 and 782.10

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Solution

The fourth proportional to 1,403.10, 1,936.20 and 782.10 is: 1,079.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.10 : 1,936.20 = 782.10 : x
  2. Step 2: Convert to fraction form
    1,403.10/1,936.20 = 782.10/x
  3. Step 3: Cross multiply
    1,403.10x = 1,936.20 × 782.10
  4. Step 4: Simplify right side
    1,403.10x = 1,514,302.02
  5. Step 5: Solve for x
    x = 1,514,302.02/1,403.10
  6. Step 6: Final answer
    x = 1,079.25

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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.