Home / 1,215.31-1,823.15-445.75

Finding the Fourth Proportional to 1,215.31, 1,823.15 and 445.75

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Solution

The fourth proportional to 1,215.31, 1,823.15 and 445.75 is: 668.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.31 : 1,823.15 = 445.75 : x
  2. Step 2: Convert to fraction form
    1,215.31/1,823.15 = 445.75/x
  3. Step 3: Cross multiply
    1,215.31x = 1,823.15 × 445.75
  4. Step 4: Simplify right side
    1,215.31x = 812,669.11
  5. Step 5: Solve for x
    x = 812,669.11/1,215.31
  6. Step 6: Final answer
    x = 668.69

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Double scale
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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.