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Finding the Fourth Proportional to 2,171.51, 3,256.29 and 690.45

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Solution

The fourth proportional to 2,171.51, 3,256.29 and 690.45 is: 1,035.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.51 : 3,256.29 = 690.45 : x
  2. Step 2: Convert to fraction form
    2,171.51/3,256.29 = 690.45/x
  3. Step 3: Cross multiply
    2,171.51x = 3,256.29 × 690.45
  4. Step 4: Simplify right side
    2,171.51x = 2,248,316.08
  5. Step 5: Solve for x
    x = 2,248,316.08/2,171.51
  6. Step 6: Final answer
    x = 1,035.37

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1.5x scale

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.