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Finding the Fourth Proportional to 1,311.61, 1,809.99 and 722.14

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Solution

The fourth proportional to 1,311.61, 1,809.99 and 722.14 is: 996.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.61 : 1,809.99 = 722.14 : x
  2. Step 2: Convert to fraction form
    1,311.61/1,809.99 = 722.14/x
  3. Step 3: Cross multiply
    1,311.61x = 1,809.99 × 722.14
  4. Step 4: Simplify right side
    1,311.61x = 1,307,066.18
  5. Step 5: Solve for x
    x = 1,307,066.18/1,311.61
  6. Step 6: Final answer
    x = 996.54

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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.