Home / 1,216.10-1,820.55-805.70

Finding the Fourth Proportional to 1,216.10, 1,820.55 and 805.70

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Solution

The fourth proportional to 1,216.10, 1,820.55 and 805.70 is: 1,206.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.10 : 1,820.55 = 805.70 : x
  2. Step 2: Convert to fraction form
    1,216.10/1,820.55 = 805.70/x
  3. Step 3: Cross multiply
    1,216.10x = 1,820.55 × 805.70
  4. Step 4: Simplify right side
    1,216.10x = 1,466,817.14
  5. Step 5: Solve for x
    x = 1,466,817.14/1,216.10
  6. Step 6: Final answer
    x = 1,206.16

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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.