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Finding the Fourth Proportional to 1,619.91, 2,235.74 and 921.51

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Solution

The fourth proportional to 1,619.91, 2,235.74 and 921.51 is: 1,271.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.91 : 2,235.74 = 921.51 : x
  2. Step 2: Convert to fraction form
    1,619.91/2,235.74 = 921.51/x
  3. Step 3: Cross multiply
    1,619.91x = 2,235.74 × 921.51
  4. Step 4: Simplify right side
    1,619.91x = 2,060,252.16
  5. Step 5: Solve for x
    x = 2,060,252.16/1,619.91
  6. Step 6: Final answer
    x = 1,271.83

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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.