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Finding the Fourth Proportional to 1,392.16, 1,921.14 and 786.55

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Solution

The fourth proportional to 1,392.16, 1,921.14 and 786.55 is: 1,085.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.16 : 1,921.14 = 786.55 : x
  2. Step 2: Convert to fraction form
    1,392.16/1,921.14 = 786.55/x
  3. Step 3: Cross multiply
    1,392.16x = 1,921.14 × 786.55
  4. Step 4: Simplify right side
    1,392.16x = 1,511,072.67
  5. Step 5: Solve for x
    x = 1,511,072.67/1,392.16
  6. Step 6: Final answer
    x = 1,085.42

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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.