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Finding the Fourth Proportional to 1,681.90, 2,520.27 and 860.38

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Solution

The fourth proportional to 1,681.90, 2,520.27 and 860.38 is: 1,289.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.90 : 2,520.27 = 860.38 : x
  2. Step 2: Convert to fraction form
    1,681.90/2,520.27 = 860.38/x
  3. Step 3: Cross multiply
    1,681.90x = 2,520.27 × 860.38
  4. Step 4: Simplify right side
    1,681.90x = 2,168,383.60
  5. Step 5: Solve for x
    x = 2,168,383.60/1,681.90
  6. Step 6: Final answer
    x = 1,289.25

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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.