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Finding the Fourth Proportional to 681.58, 1,022.64 and 389.08

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Solution

The fourth proportional to 681.58, 1,022.64 and 389.08 is: 583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.58 : 1,022.64 = 389.08 : x
  2. Step 2: Convert to fraction form
    681.58/1,022.64 = 389.08/x
  3. Step 3: Cross multiply
    681.58x = 1,022.64 × 389.08
  4. Step 4: Simplify right side
    681.58x = 397,888.77
  5. Step 5: Solve for x
    x = 397,888.77/681.58
  6. Step 6: Final answer
    x = 583.77

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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.