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Finding the Fourth Proportional to 1,872.51, 2,808.74 and 485.72

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Solution

The fourth proportional to 1,872.51, 2,808.74 and 485.72 is: 728.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.51 : 2,808.74 = 485.72 : x
  2. Step 2: Convert to fraction form
    1,872.51/2,808.74 = 485.72/x
  3. Step 3: Cross multiply
    1,872.51x = 2,808.74 × 485.72
  4. Step 4: Simplify right side
    1,872.51x = 1,364,269.43
  5. Step 5: Solve for x
    x = 1,364,269.43/1,872.51
  6. Step 6: Final answer
    x = 728.58

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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.