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Finding the Fourth Proportional to 790.70, 1,186.47 and 748.46

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Solution

The fourth proportional to 790.70, 1,186.47 and 748.46 is: 1,123.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.70 : 1,186.47 = 748.46 : x
  2. Step 2: Convert to fraction form
    790.70/1,186.47 = 748.46/x
  3. Step 3: Cross multiply
    790.70x = 1,186.47 × 748.46
  4. Step 4: Simplify right side
    790.70x = 888,019.40
  5. Step 5: Solve for x
    x = 888,019.40/790.70
  6. Step 6: Final answer
    x = 1,123.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.