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Finding the Fourth Proportional to 986.79, 1,361.80 and 567.21

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Solution

The fourth proportional to 986.79, 1,361.80 and 567.21 is: 782.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.79 : 1,361.80 = 567.21 : x
  2. Step 2: Convert to fraction form
    986.79/1,361.80 = 567.21/x
  3. Step 3: Cross multiply
    986.79x = 1,361.80 × 567.21
  4. Step 4: Simplify right side
    986.79x = 772,426.58
  5. Step 5: Solve for x
    x = 772,426.58/986.79
  6. Step 6: Final answer
    x = 782.77

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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.