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Finding the Fourth Proportional to 1,211.15, 1,817.03 and 345.46

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Solution

The fourth proportional to 1,211.15, 1,817.03 and 345.46 is: 518.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.15 : 1,817.03 = 345.46 : x
  2. Step 2: Convert to fraction form
    1,211.15/1,817.03 = 345.46/x
  3. Step 3: Cross multiply
    1,211.15x = 1,817.03 × 345.46
  4. Step 4: Simplify right side
    1,211.15x = 627,711.18
  5. Step 5: Solve for x
    x = 627,711.18/1,211.15
  6. Step 6: Final answer
    x = 518.28

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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.