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Finding the Fourth Proportional to 1,235.30, 1,705.49 and 920.21

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Solution

The fourth proportional to 1,235.30, 1,705.49 and 920.21 is: 1,270.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.30 : 1,705.49 = 920.21 : x
  2. Step 2: Convert to fraction form
    1,235.30/1,705.49 = 920.21/x
  3. Step 3: Cross multiply
    1,235.30x = 1,705.49 × 920.21
  4. Step 4: Simplify right side
    1,235.30x = 1,569,408.95
  5. Step 5: Solve for x
    x = 1,569,408.95/1,235.30
  6. Step 6: Final answer
    x = 1,270.47

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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.