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Finding the Fourth Proportional to 1,305.51, 1,958.25 and 612.65

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Solution

The fourth proportional to 1,305.51, 1,958.25 and 612.65 is: 918.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.51 : 1,958.25 = 612.65 : x
  2. Step 2: Convert to fraction form
    1,305.51/1,958.25 = 612.65/x
  3. Step 3: Cross multiply
    1,305.51x = 1,958.25 × 612.65
  4. Step 4: Simplify right side
    1,305.51x = 1,199,729.06
  5. Step 5: Solve for x
    x = 1,199,729.06/1,305.51
  6. Step 6: Final answer
    x = 918.98

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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.