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Finding the Fourth Proportional to 1,858, 2,787.18 and 625.72

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Solution

The fourth proportional to 1,858, 2,787.18 and 625.72 is: 938.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858 : 2,787.18 = 625.72 : x
  2. Step 2: Convert to fraction form
    1,858/2,787.18 = 625.72/x
  3. Step 3: Cross multiply
    1,858x = 2,787.18 × 625.72
  4. Step 4: Simplify right side
    1,858x = 1,743,994.27
  5. Step 5: Solve for x
    x = 1,743,994.27/1,858
  6. Step 6: Final answer
    x = 938.64

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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.