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Finding the Fourth Proportional to 1,643.22, 2,465.10 and 820.67

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Solution

The fourth proportional to 1,643.22, 2,465.10 and 820.67 is: 1,231.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.22 : 2,465.10 = 820.67 : x
  2. Step 2: Convert to fraction form
    1,643.22/2,465.10 = 820.67/x
  3. Step 3: Cross multiply
    1,643.22x = 2,465.10 × 820.67
  4. Step 4: Simplify right side
    1,643.22x = 2,023,021.29
  5. Step 5: Solve for x
    x = 2,023,021.29/1,643.22
  6. Step 6: Final answer
    x = 1,231.13

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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.