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Finding the Fourth Proportional to 1,309.76, 1,806.53 and 1,111.90

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Solution

The fourth proportional to 1,309.76, 1,806.53 and 1,111.90 is: 1,533.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.76 : 1,806.53 = 1,111.90 : x
  2. Step 2: Convert to fraction form
    1,309.76/1,806.53 = 1,111.90/x
  3. Step 3: Cross multiply
    1,309.76x = 1,806.53 × 1,111.90
  4. Step 4: Simplify right side
    1,309.76x = 2,008,678.97
  5. Step 5: Solve for x
    x = 2,008,678.97/1,309.76
  6. Step 6: Final answer
    x = 1,533.63

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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.