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Finding the Fourth Proportional to 1,235.21, 1,852.31 and 618.18

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Solution

The fourth proportional to 1,235.21, 1,852.31 and 618.18 is: 927.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.21 : 1,852.31 = 618.18 : x
  2. Step 2: Convert to fraction form
    1,235.21/1,852.31 = 618.18/x
  3. Step 3: Cross multiply
    1,235.21x = 1,852.31 × 618.18
  4. Step 4: Simplify right side
    1,235.21x = 1,145,061.00
  5. Step 5: Solve for x
    x = 1,145,061.00/1,235.21
  6. Step 6: Final answer
    x = 927.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.