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Finding the Fourth Proportional to 1,070.73, 1,611.79 and 764.70

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Solution

The fourth proportional to 1,070.73, 1,611.79 and 764.70 is: 1,151.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.73 : 1,611.79 = 764.70 : x
  2. Step 2: Convert to fraction form
    1,070.73/1,611.79 = 764.70/x
  3. Step 3: Cross multiply
    1,070.73x = 1,611.79 × 764.70
  4. Step 4: Simplify right side
    1,070.73x = 1,232,535.81
  5. Step 5: Solve for x
    x = 1,232,535.81/1,070.73
  6. Step 6: Final answer
    x = 1,151.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.