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Finding the Fourth Proportional to 763.80, 1,051.74 and 721.08

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Solution

The fourth proportional to 763.80, 1,051.74 and 721.08 is: 992.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.80 : 1,051.74 = 721.08 : x
  2. Step 2: Convert to fraction form
    763.80/1,051.74 = 721.08/x
  3. Step 3: Cross multiply
    763.80x = 1,051.74 × 721.08
  4. Step 4: Simplify right side
    763.80x = 758,388.68
  5. Step 5: Solve for x
    x = 758,388.68/763.80
  6. Step 6: Final answer
    x = 992.92

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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.