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Finding the Fourth Proportional to 1,628.77, 2,247.15 and 920.51

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Solution

The fourth proportional to 1,628.77, 2,247.15 and 920.51 is: 1,269.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.77 : 2,247.15 = 920.51 : x
  2. Step 2: Convert to fraction form
    1,628.77/2,247.15 = 920.51/x
  3. Step 3: Cross multiply
    1,628.77x = 2,247.15 × 920.51
  4. Step 4: Simplify right side
    1,628.77x = 2,068,524.05
  5. Step 5: Solve for x
    x = 2,068,524.05/1,628.77
  6. Step 6: Final answer
    x = 1,269.99

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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.