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Finding the Fourth Proportional to 985.77, 1,361.00 and 612.90

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Solution

The fourth proportional to 985.77, 1,361.00 and 612.90 is: 846.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.77 : 1,361.00 = 612.90 : x
  2. Step 2: Convert to fraction form
    985.77/1,361.00 = 612.90/x
  3. Step 3: Cross multiply
    985.77x = 1,361.00 × 612.90
  4. Step 4: Simplify right side
    985.77x = 834,158.43
  5. Step 5: Solve for x
    x = 834,158.43/985.77
  6. Step 6: Final answer
    x = 846.20

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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.