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Finding the Fourth Proportional to 1,309.39, 1,806.98 and 720.02

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Solution

The fourth proportional to 1,309.39, 1,806.98 and 720.02 is: 993.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.39 : 1,806.98 = 720.02 : x
  2. Step 2: Convert to fraction form
    1,309.39/1,806.98 = 720.02/x
  3. Step 3: Cross multiply
    1,309.39x = 1,806.98 × 720.02
  4. Step 4: Simplify right side
    1,309.39x = 1,301,062.66
  5. Step 5: Solve for x
    x = 1,301,062.66/1,309.39
  6. Step 6: Final answer
    x = 993.64

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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.