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Finding the Fourth Proportional to 770.55, 1,064.43 and 687.63

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Solution

The fourth proportional to 770.55, 1,064.43 and 687.63 is: 949.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.55 : 1,064.43 = 687.63 : x
  2. Step 2: Convert to fraction form
    770.55/1,064.43 = 687.63/x
  3. Step 3: Cross multiply
    770.55x = 1,064.43 × 687.63
  4. Step 4: Simplify right side
    770.55x = 731,934.00
  5. Step 5: Solve for x
    x = 731,934.00/770.55
  6. Step 6: Final answer
    x = 949.89

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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.