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Finding the Fourth Proportional to 1,361.60, 1,877.14 and 1,223.21

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Solution

The fourth proportional to 1,361.60, 1,877.14 and 1,223.21 is: 1,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.60 : 1,877.14 = 1,223.21 : x
  2. Step 2: Convert to fraction form
    1,361.60/1,877.14 = 1,223.21/x
  3. Step 3: Cross multiply
    1,361.60x = 1,877.14 × 1,223.21
  4. Step 4: Simplify right side
    1,361.60x = 2,296,136.42
  5. Step 5: Solve for x
    x = 2,296,136.42/1,361.60
  6. Step 6: Final answer
    x = 1,686.35

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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.