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Finding the Fourth Proportional to 1,215.45, 1,821.74 and 999.45

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Solution

The fourth proportional to 1,215.45, 1,821.74 and 999.45 is: 1,497.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.45 : 1,821.74 = 999.45 : x
  2. Step 2: Convert to fraction form
    1,215.45/1,821.74 = 999.45/x
  3. Step 3: Cross multiply
    1,215.45x = 1,821.74 × 999.45
  4. Step 4: Simplify right side
    1,215.45x = 1,820,733.05
  5. Step 5: Solve for x
    x = 1,820,733.05/1,215.45
  6. Step 6: Final answer
    x = 1,497.99

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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.