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Finding the Fourth Proportional to 1,115.23, 1,539.33 and 783.74

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Solution

The fourth proportional to 1,115.23, 1,539.33 and 783.74 is: 1,081.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.23 : 1,539.33 = 783.74 : x
  2. Step 2: Convert to fraction form
    1,115.23/1,539.33 = 783.74/x
  3. Step 3: Cross multiply
    1,115.23x = 1,539.33 × 783.74
  4. Step 4: Simplify right side
    1,115.23x = 1,206,434.49
  5. Step 5: Solve for x
    x = 1,206,434.49/1,115.23
  6. Step 6: Final answer
    x = 1,081.79

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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.