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Finding the Fourth Proportional to 770.66, 1,060.72 and 696.81

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Solution

The fourth proportional to 770.66, 1,060.72 and 696.81 is: 959.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.66 : 1,060.72 = 696.81 : x
  2. Step 2: Convert to fraction form
    770.66/1,060.72 = 696.81/x
  3. Step 3: Cross multiply
    770.66x = 1,060.72 × 696.81
  4. Step 4: Simplify right side
    770.66x = 739,118.56
  5. Step 5: Solve for x
    x = 739,118.56/770.66
  6. Step 6: Final answer
    x = 959.08

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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.