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Finding the Fourth Proportional to 1,020.04, 1,407.78 and 671.44

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Solution

The fourth proportional to 1,020.04, 1,407.78 and 671.44 is: 926.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.04 : 1,407.78 = 671.44 : x
  2. Step 2: Convert to fraction form
    1,020.04/1,407.78 = 671.44/x
  3. Step 3: Cross multiply
    1,020.04x = 1,407.78 × 671.44
  4. Step 4: Simplify right side
    1,020.04x = 945,239.80
  5. Step 5: Solve for x
    x = 945,239.80/1,020.04
  6. Step 6: Final answer
    x = 926.67

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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.