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Finding the Fourth Proportional to 763.72, 1,054.19 and 484.42

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Solution

The fourth proportional to 763.72, 1,054.19 and 484.42 is: 668.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.72 : 1,054.19 = 484.42 : x
  2. Step 2: Convert to fraction form
    763.72/1,054.19 = 484.42/x
  3. Step 3: Cross multiply
    763.72x = 1,054.19 × 484.42
  4. Step 4: Simplify right side
    763.72x = 510,670.72
  5. Step 5: Solve for x
    x = 510,670.72/763.72
  6. Step 6: Final answer
    x = 668.66

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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.