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Finding the Fourth Proportional to 1,020.36, 1,408.62 and 920.76

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Solution

The fourth proportional to 1,020.36, 1,408.62 and 920.76 is: 1,271.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.36 : 1,408.62 = 920.76 : x
  2. Step 2: Convert to fraction form
    1,020.36/1,408.62 = 920.76/x
  3. Step 3: Cross multiply
    1,020.36x = 1,408.62 × 920.76
  4. Step 4: Simplify right side
    1,020.36x = 1,297,000.95
  5. Step 5: Solve for x
    x = 1,297,000.95/1,020.36
  6. Step 6: Final answer
    x = 1,271.12

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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.