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Finding the Fourth Proportional to 1,687.57, 2,328.01 and 1,128.21

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Solution

The fourth proportional to 1,687.57, 2,328.01 and 1,128.21 is: 1,556.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.57 : 2,328.01 = 1,128.21 : x
  2. Step 2: Convert to fraction form
    1,687.57/2,328.01 = 1,128.21/x
  3. Step 3: Cross multiply
    1,687.57x = 2,328.01 × 1,128.21
  4. Step 4: Simplify right side
    1,687.57x = 2,626,485.71
  5. Step 5: Solve for x
    x = 2,626,485.71/1,687.57
  6. Step 6: Final answer
    x = 1,556.37

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1.5x scale

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.