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Finding the Fourth Proportional to 1,403.07, 1,936.25 and 782.07

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Solution

The fourth proportional to 1,403.07, 1,936.25 and 782.07 is: 1,079.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.07 : 1,936.25 = 782.07 : x
  2. Step 2: Convert to fraction form
    1,403.07/1,936.25 = 782.07/x
  3. Step 3: Cross multiply
    1,403.07x = 1,936.25 × 782.07
  4. Step 4: Simplify right side
    1,403.07x = 1,514,279.13
  5. Step 5: Solve for x
    x = 1,514,279.13/1,403.07
  6. Step 6: Final answer
    x = 1,079.26

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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.