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Finding the Fourth Proportional to 1,620.60, 2,235.72 and 957.21

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Solution

The fourth proportional to 1,620.60, 2,235.72 and 957.21 is: 1,320.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.60 : 2,235.72 = 957.21 : x
  2. Step 2: Convert to fraction form
    1,620.60/2,235.72 = 957.21/x
  3. Step 3: Cross multiply
    1,620.60x = 2,235.72 × 957.21
  4. Step 4: Simplify right side
    1,620.60x = 2,140,053.54
  5. Step 5: Solve for x
    x = 2,140,053.54/1,620.60
  6. Step 6: Final answer
    x = 1,320.53

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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.