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Finding the Fourth Proportional to 1,211.67, 1,815.66 and 902.07

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Solution

The fourth proportional to 1,211.67, 1,815.66 and 902.07 is: 1,351.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.67 : 1,815.66 = 902.07 : x
  2. Step 2: Convert to fraction form
    1,211.67/1,815.66 = 902.07/x
  3. Step 3: Cross multiply
    1,211.67x = 1,815.66 × 902.07
  4. Step 4: Simplify right side
    1,211.67x = 1,637,852.42
  5. Step 5: Solve for x
    x = 1,637,852.42/1,211.67
  6. Step 6: Final answer
    x = 1,351.73

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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.