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Finding the Fourth Proportional to 942.62, 1,300.09 and 721.02

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Solution

The fourth proportional to 942.62, 1,300.09 and 721.02 is: 994.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.62 : 1,300.09 = 721.02 : x
  2. Step 2: Convert to fraction form
    942.62/1,300.09 = 721.02/x
  3. Step 3: Cross multiply
    942.62x = 1,300.09 × 721.02
  4. Step 4: Simplify right side
    942.62x = 937,390.89
  5. Step 5: Solve for x
    x = 937,390.89/942.62
  6. Step 6: Final answer
    x = 994.45

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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.