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Finding the Fourth Proportional to 879.40, 1,316.40 and 636.40

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Solution

The fourth proportional to 879.40, 1,316.40 and 636.40 is: 952.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.40 : 1,316.40 = 636.40 : x
  2. Step 2: Convert to fraction form
    879.40/1,316.40 = 636.40/x
  3. Step 3: Cross multiply
    879.40x = 1,316.40 × 636.40
  4. Step 4: Simplify right side
    879.40x = 837,756.96
  5. Step 5: Solve for x
    x = 837,756.96/879.40
  6. Step 6: Final answer
    x = 952.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.