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Finding the Fourth Proportional to 1,538.51, 2,309.80 and 717.35

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Solution

The fourth proportional to 1,538.51, 2,309.80 and 717.35 is: 1,076.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.51 : 2,309.80 = 717.35 : x
  2. Step 2: Convert to fraction form
    1,538.51/2,309.80 = 717.35/x
  3. Step 3: Cross multiply
    1,538.51x = 2,309.80 × 717.35
  4. Step 4: Simplify right side
    1,538.51x = 1,656,936.03
  5. Step 5: Solve for x
    x = 1,656,936.03/1,538.51
  6. Step 6: Final answer
    x = 1,076.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.