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Finding the Fourth Proportional to 1,858.91, 2,787.21 and 626.20

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Solution

The fourth proportional to 1,858.91, 2,787.21 and 626.20 is: 938.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.91 : 2,787.21 = 626.20 : x
  2. Step 2: Convert to fraction form
    1,858.91/2,787.21 = 626.20/x
  3. Step 3: Cross multiply
    1,858.91x = 2,787.21 × 626.20
  4. Step 4: Simplify right side
    1,858.91x = 1,745,343.93
  5. Step 5: Solve for x
    x = 1,745,343.93/1,858.91
  6. Step 6: Final answer
    x = 938.91

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1.5x scale

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.