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Finding the Fourth Proportional to 1,628.81, 2,247.62 and 920.71

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Solution

The fourth proportional to 1,628.81, 2,247.62 and 920.71 is: 1,270.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.81 : 2,247.62 = 920.71 : x
  2. Step 2: Convert to fraction form
    1,628.81/2,247.62 = 920.71/x
  3. Step 3: Cross multiply
    1,628.81x = 2,247.62 × 920.71
  4. Step 4: Simplify right side
    1,628.81x = 2,069,406.21
  5. Step 5: Solve for x
    x = 2,069,406.21/1,628.81
  6. Step 6: Final answer
    x = 1,270.50

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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.