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Finding the Fourth Proportional to 3,126.91, 4,690.43 and 935.72

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Solution

The fourth proportional to 3,126.91, 4,690.43 and 935.72 is: 1,403.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,126.91 : 4,690.43 = 935.72 : x
  2. Step 2: Convert to fraction form
    3,126.91/4,690.43 = 935.72/x
  3. Step 3: Cross multiply
    3,126.91x = 4,690.43 × 935.72
  4. Step 4: Simplify right side
    3,126.91x = 4,388,929.16
  5. Step 5: Solve for x
    x = 4,388,929.16/3,126.91
  6. Step 6: Final answer
    x = 1,403.60

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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.