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Finding the Fourth Proportional to 770.79, 1,063.75 and 439.23

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Solution

The fourth proportional to 770.79, 1,063.75 and 439.23 is: 606.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.79 : 1,063.75 = 439.23 : x
  2. Step 2: Convert to fraction form
    770.79/1,063.75 = 439.23/x
  3. Step 3: Cross multiply
    770.79x = 1,063.75 × 439.23
  4. Step 4: Simplify right side
    770.79x = 467,230.91
  5. Step 5: Solve for x
    x = 467,230.91/770.79
  6. Step 6: Final answer
    x = 606.17

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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.