Home / 1,210.21-1,668.14-816.55

Finding the Fourth Proportional to 1,210.21, 1,668.14 and 816.55

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Solution

The fourth proportional to 1,210.21, 1,668.14 and 816.55 is: 1,125.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.21 : 1,668.14 = 816.55 : x
  2. Step 2: Convert to fraction form
    1,210.21/1,668.14 = 816.55/x
  3. Step 3: Cross multiply
    1,210.21x = 1,668.14 × 816.55
  4. Step 4: Simplify right side
    1,210.21x = 1,362,107.29
  5. Step 5: Solve for x
    x = 1,362,107.29/1,210.21
  6. Step 6: Final answer
    x = 1,125.52

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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.