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Finding the Fourth Proportional to 2,817.18, 4,220.28 and 1,890.18

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Solution

The fourth proportional to 2,817.18, 4,220.28 and 1,890.18 is: 2,831.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,817.18 : 4,220.28 = 1,890.18 : x
  2. Step 2: Convert to fraction form
    2,817.18/4,220.28 = 1,890.18/x
  3. Step 3: Cross multiply
    2,817.18x = 4,220.28 × 1,890.18
  4. Step 4: Simplify right side
    2,817.18x = 7,977,088.85
  5. Step 5: Solve for x
    x = 7,977,088.85/2,817.18
  6. Step 6: Final answer
    x = 2,831.59

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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.