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Finding the Fourth Proportional to 1,072.23, 1,478.46 and 740.89

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Solution

The fourth proportional to 1,072.23, 1,478.46 and 740.89 is: 1,021.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.23 : 1,478.46 = 740.89 : x
  2. Step 2: Convert to fraction form
    1,072.23/1,478.46 = 740.89/x
  3. Step 3: Cross multiply
    1,072.23x = 1,478.46 × 740.89
  4. Step 4: Simplify right side
    1,072.23x = 1,095,376.23
  5. Step 5: Solve for x
    x = 1,095,376.23/1,072.23
  6. Step 6: Final answer
    x = 1,021.59

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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.