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Finding the Fourth Proportional to 1,114.35, 1,538.13 and 782.86

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Solution

The fourth proportional to 1,114.35, 1,538.13 and 782.86 is: 1,080.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.35 : 1,538.13 = 782.86 : x
  2. Step 2: Convert to fraction form
    1,114.35/1,538.13 = 782.86/x
  3. Step 3: Cross multiply
    1,114.35x = 1,538.13 × 782.86
  4. Step 4: Simplify right side
    1,114.35x = 1,204,136.54
  5. Step 5: Solve for x
    x = 1,204,136.54/1,114.35
  6. Step 6: Final answer
    x = 1,080.57

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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.