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Finding the Fourth Proportional to 2,561.12, 3,841.57 and 687.01

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Solution

The fourth proportional to 2,561.12, 3,841.57 and 687.01 is: 1,030.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,561.12 : 3,841.57 = 687.01 : x
  2. Step 2: Convert to fraction form
    2,561.12/3,841.57 = 687.01/x
  3. Step 3: Cross multiply
    2,561.12x = 3,841.57 × 687.01
  4. Step 4: Simplify right side
    2,561.12x = 2,639,204.34
  5. Step 5: Solve for x
    x = 2,639,204.34/2,561.12
  6. Step 6: Final answer
    x = 1,030.49

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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.