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Finding the Fourth Proportional to 949.62, 1,421.26 and 867.50

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Solution

The fourth proportional to 949.62, 1,421.26 and 867.50 is: 1,298.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.62 : 1,421.26 = 867.50 : x
  2. Step 2: Convert to fraction form
    949.62/1,421.26 = 867.50/x
  3. Step 3: Cross multiply
    949.62x = 1,421.26 × 867.50
  4. Step 4: Simplify right side
    949.62x = 1,232,943.05
  5. Step 5: Solve for x
    x = 1,232,943.05/949.62
  6. Step 6: Final answer
    x = 1,298.35

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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.