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Finding the Fourth Proportional to 1,620.47, 2,235.75 and 957.56

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Solution

The fourth proportional to 1,620.47, 2,235.75 and 957.56 is: 1,321.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.47 : 2,235.75 = 957.56 : x
  2. Step 2: Convert to fraction form
    1,620.47/2,235.75 = 957.56/x
  3. Step 3: Cross multiply
    1,620.47x = 2,235.75 × 957.56
  4. Step 4: Simplify right side
    1,620.47x = 2,140,864.77
  5. Step 5: Solve for x
    x = 2,140,864.77/1,620.47
  6. Step 6: Final answer
    x = 1,321.14

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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.