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Finding the Fourth Proportional to 1,309.47, 1,807 and 720.01

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Solution

The fourth proportional to 1,309.47, 1,807 and 720.01 is: 993.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.47 : 1,807 = 720.01 : x
  2. Step 2: Convert to fraction form
    1,309.47/1,807 = 720.01/x
  3. Step 3: Cross multiply
    1,309.47x = 1,807 × 720.01
  4. Step 4: Simplify right side
    1,309.47x = 1,301,058.07
  5. Step 5: Solve for x
    x = 1,301,058.07/1,309.47
  6. Step 6: Final answer
    x = 993.58

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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.