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Finding the Fourth Proportional to 770.22, 1,063.04 and 455.47

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Solution

The fourth proportional to 770.22, 1,063.04 and 455.47 is: 628.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.22 : 1,063.04 = 455.47 : x
  2. Step 2: Convert to fraction form
    770.22/1,063.04 = 455.47/x
  3. Step 3: Cross multiply
    770.22x = 1,063.04 × 455.47
  4. Step 4: Simplify right side
    770.22x = 484,182.83
  5. Step 5: Solve for x
    x = 484,182.83/770.22
  6. Step 6: Final answer
    x = 628.63

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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.