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Finding the Fourth Proportional to 1,621.87, 2,238.23 and 913.74

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Solution

The fourth proportional to 1,621.87, 2,238.23 and 913.74 is: 1,260.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.87 : 2,238.23 = 913.74 : x
  2. Step 2: Convert to fraction form
    1,621.87/2,238.23 = 913.74/x
  3. Step 3: Cross multiply
    1,621.87x = 2,238.23 × 913.74
  4. Step 4: Simplify right side
    1,621.87x = 2,045,155.71
  5. Step 5: Solve for x
    x = 2,045,155.71/1,621.87
  6. Step 6: Final answer
    x = 1,260.99

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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.