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Finding the Fourth Proportional to 1,681.21, 2,521.81 and 511.21

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Solution

The fourth proportional to 1,681.21, 2,521.81 and 511.21 is: 766.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.21 : 2,521.81 = 511.21 : x
  2. Step 2: Convert to fraction form
    1,681.21/2,521.81 = 511.21/x
  3. Step 3: Cross multiply
    1,681.21x = 2,521.81 × 511.21
  4. Step 4: Simplify right side
    1,681.21x = 1,289,164.10
  5. Step 5: Solve for x
    x = 1,289,164.10/1,681.21
  6. Step 6: Final answer
    x = 766.81

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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.