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Finding the Fourth Proportional to 1,686.81, 2,530.26 and 917.31

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Solution

The fourth proportional to 1,686.81, 2,530.26 and 917.31 is: 1,375.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.81 : 2,530.26 = 917.31 : x
  2. Step 2: Convert to fraction form
    1,686.81/2,530.26 = 917.31/x
  3. Step 3: Cross multiply
    1,686.81x = 2,530.26 × 917.31
  4. Step 4: Simplify right side
    1,686.81x = 2,321,032.80
  5. Step 5: Solve for x
    x = 2,321,032.80/1,686.81
  6. Step 6: Final answer
    x = 1,375.99

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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.