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Finding the Fourth Proportional to 742.26, 1,025.60 and 715.98

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Solution

The fourth proportional to 742.26, 1,025.60 and 715.98 is: 989.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.26 : 1,025.60 = 715.98 : x
  2. Step 2: Convert to fraction form
    742.26/1,025.60 = 715.98/x
  3. Step 3: Cross multiply
    742.26x = 1,025.60 × 715.98
  4. Step 4: Simplify right side
    742.26x = 734,305.51
  5. Step 5: Solve for x
    x = 734,305.51/742.26
  6. Step 6: Final answer
    x = 989.28

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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.