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Finding the Fourth Proportional to 1,381.90, 1,907 and 792.40

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Solution

The fourth proportional to 1,381.90, 1,907 and 792.40 is: 1,093.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.90 : 1,907 = 792.40 : x
  2. Step 2: Convert to fraction form
    1,381.90/1,907 = 792.40/x
  3. Step 3: Cross multiply
    1,381.90x = 1,907 × 792.40
  4. Step 4: Simplify right side
    1,381.90x = 1,511,106.80
  5. Step 5: Solve for x
    x = 1,511,106.80/1,381.90
  6. Step 6: Final answer
    x = 1,093.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.