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Finding the Fourth Proportional to 763.94, 1,054.23 and 449.21

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Solution

The fourth proportional to 763.94, 1,054.23 and 449.21 is: 619.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.94 : 1,054.23 = 449.21 : x
  2. Step 2: Convert to fraction form
    763.94/1,054.23 = 449.21/x
  3. Step 3: Cross multiply
    763.94x = 1,054.23 × 449.21
  4. Step 4: Simplify right side
    763.94x = 473,570.66
  5. Step 5: Solve for x
    x = 473,570.66/763.94
  6. Step 6: Final answer
    x = 619.91

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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.