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Finding the Fourth Proportional to 1,309.48, 1,807.09 and 720.02

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Solution

The fourth proportional to 1,309.48, 1,807.09 and 720.02 is: 993.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.48 : 1,807.09 = 720.02 : x
  2. Step 2: Convert to fraction form
    1,309.48/1,807.09 = 720.02/x
  3. Step 3: Cross multiply
    1,309.48x = 1,807.09 × 720.02
  4. Step 4: Simplify right side
    1,309.48x = 1,301,140.94
  5. Step 5: Solve for x
    x = 1,301,140.94/1,309.48
  6. Step 6: Final answer
    x = 993.63

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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.