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Finding the Fourth Proportional to 1,245.15, 1,864.48 and 665.19

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Solution

The fourth proportional to 1,245.15, 1,864.48 and 665.19 is: 996.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.15 : 1,864.48 = 665.19 : x
  2. Step 2: Convert to fraction form
    1,245.15/1,864.48 = 665.19/x
  3. Step 3: Cross multiply
    1,245.15x = 1,864.48 × 665.19
  4. Step 4: Simplify right side
    1,245.15x = 1,240,233.45
  5. Step 5: Solve for x
    x = 1,240,233.45/1,245.15
  6. Step 6: Final answer
    x = 996.05

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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.