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Finding the Fourth Proportional to 681.60, 1,022.21 and 291.40

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Solution

The fourth proportional to 681.60, 1,022.21 and 291.40 is: 437.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.60 : 1,022.21 = 291.40 : x
  2. Step 2: Convert to fraction form
    681.60/1,022.21 = 291.40/x
  3. Step 3: Cross multiply
    681.60x = 1,022.21 × 291.40
  4. Step 4: Simplify right side
    681.60x = 297,875.37
  5. Step 5: Solve for x
    x = 297,875.37/681.60
  6. Step 6: Final answer
    x = 437.03

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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.