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Finding the Fourth Proportional to 2,157.15, 3,235.65 and 618.15

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Solution

The fourth proportional to 2,157.15, 3,235.65 and 618.15 is: 927.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.15 : 3,235.65 = 618.15 : x
  2. Step 2: Convert to fraction form
    2,157.15/3,235.65 = 618.15/x
  3. Step 3: Cross multiply
    2,157.15x = 3,235.65 × 618.15
  4. Step 4: Simplify right side
    2,157.15x = 2,000,117.05
  5. Step 5: Solve for x
    x = 2,000,117.05/2,157.15
  6. Step 6: Final answer
    x = 927.20

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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.