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Finding the Fourth Proportional to 742.86, 1,025.64 and 696.40

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Solution

The fourth proportional to 742.86, 1,025.64 and 696.40 is: 961.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.86 : 1,025.64 = 696.40 : x
  2. Step 2: Convert to fraction form
    742.86/1,025.64 = 696.40/x
  3. Step 3: Cross multiply
    742.86x = 1,025.64 × 696.40
  4. Step 4: Simplify right side
    742.86x = 714,253.13
  5. Step 5: Solve for x
    x = 714,253.13/742.86
  6. Step 6: Final answer
    x = 961.49

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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.