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Finding the Fourth Proportional to 1,126.90, 1,690.36 and 396.30

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Solution

The fourth proportional to 1,126.90, 1,690.36 and 396.30 is: 594.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.90 : 1,690.36 = 396.30 : x
  2. Step 2: Convert to fraction form
    1,126.90/1,690.36 = 396.30/x
  3. Step 3: Cross multiply
    1,126.90x = 1,690.36 × 396.30
  4. Step 4: Simplify right side
    1,126.90x = 669,895.02
  5. Step 5: Solve for x
    x = 669,895.02/1,126.90
  6. Step 6: Final answer
    x = 594.46

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Double scale
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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.