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Finding the Fourth Proportional to 1,690.40, 2,328.72 and 1,618.40

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Solution

The fourth proportional to 1,690.40, 2,328.72 and 1,618.40 is: 2,229.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.40 : 2,328.72 = 1,618.40 : x
  2. Step 2: Convert to fraction form
    1,690.40/2,328.72 = 1,618.40/x
  3. Step 3: Cross multiply
    1,690.40x = 2,328.72 × 1,618.40
  4. Step 4: Simplify right side
    1,690.40x = 3,768,800.45
  5. Step 5: Solve for x
    x = 3,768,800.45/1,690.40
  6. Step 6: Final answer
    x = 2,229.53

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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.