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Finding the Fourth Proportional to 1,687.26, 2,328.42 and 988.64

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Solution

The fourth proportional to 1,687.26, 2,328.42 and 988.64 is: 1,364.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.26 : 2,328.42 = 988.64 : x
  2. Step 2: Convert to fraction form
    1,687.26/2,328.42 = 988.64/x
  3. Step 3: Cross multiply
    1,687.26x = 2,328.42 × 988.64
  4. Step 4: Simplify right side
    1,687.26x = 2,301,969.15
  5. Step 5: Solve for x
    x = 2,301,969.15/1,687.26
  6. Step 6: Final answer
    x = 1,364.32

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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.