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Finding the Fourth Proportional to 986.90, 1,361.48 and 608.46

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Solution

The fourth proportional to 986.90, 1,361.48 and 608.46 is: 839.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.90 : 1,361.48 = 608.46 : x
  2. Step 2: Convert to fraction form
    986.90/1,361.48 = 608.46/x
  3. Step 3: Cross multiply
    986.90x = 1,361.48 × 608.46
  4. Step 4: Simplify right side
    986.90x = 828,405.63
  5. Step 5: Solve for x
    x = 828,405.63/986.90
  6. Step 6: Final answer
    x = 839.40

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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.