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Finding the Fourth Proportional to 1,311.62, 1,810.06 and 722.20

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Solution

The fourth proportional to 1,311.62, 1,810.06 and 722.20 is: 996.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.62 : 1,810.06 = 722.20 : x
  2. Step 2: Convert to fraction form
    1,311.62/1,810.06 = 722.20/x
  3. Step 3: Cross multiply
    1,311.62x = 1,810.06 × 722.20
  4. Step 4: Simplify right side
    1,311.62x = 1,307,225.33
  5. Step 5: Solve for x
    x = 1,307,225.33/1,311.62
  6. Step 6: Final answer
    x = 996.65

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1.5x scale

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.