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Finding the Fourth Proportional to 1,426.60, 1,969.14 and 902.80

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Solution

The fourth proportional to 1,426.60, 1,969.14 and 902.80 is: 1,246.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.60 : 1,969.14 = 902.80 : x
  2. Step 2: Convert to fraction form
    1,426.60/1,969.14 = 902.80/x
  3. Step 3: Cross multiply
    1,426.60x = 1,969.14 × 902.80
  4. Step 4: Simplify right side
    1,426.60x = 1,777,739.59
  5. Step 5: Solve for x
    x = 1,777,739.59/1,426.60
  6. Step 6: Final answer
    x = 1,246.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.