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Finding the Fourth Proportional to 770.61, 1,060.97 and 623.73

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Solution

The fourth proportional to 770.61, 1,060.97 and 623.73 is: 858.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.61 : 1,060.97 = 623.73 : x
  2. Step 2: Convert to fraction form
    770.61/1,060.97 = 623.73/x
  3. Step 3: Cross multiply
    770.61x = 1,060.97 × 623.73
  4. Step 4: Simplify right side
    770.61x = 661,758.82
  5. Step 5: Solve for x
    x = 661,758.82/770.61
  6. Step 6: Final answer
    x = 858.75

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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.