Home / 1,210.26-1,815.78-561.42

Finding the Fourth Proportional to 1,210.26, 1,815.78 and 561.42

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Solution

The fourth proportional to 1,210.26, 1,815.78 and 561.42 is: 842.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.26 : 1,815.78 = 561.42 : x
  2. Step 2: Convert to fraction form
    1,210.26/1,815.78 = 561.42/x
  3. Step 3: Cross multiply
    1,210.26x = 1,815.78 × 561.42
  4. Step 4: Simplify right side
    1,210.26x = 1,019,415.21
  5. Step 5: Solve for x
    x = 1,019,415.21/1,210.26
  6. Step 6: Final answer
    x = 842.31

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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.