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Finding the Fourth Proportional to 948.87, 1,310.28 and 917.88

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Solution

The fourth proportional to 948.87, 1,310.28 and 917.88 is: 1,267.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.87 : 1,310.28 = 917.88 : x
  2. Step 2: Convert to fraction form
    948.87/1,310.28 = 917.88/x
  3. Step 3: Cross multiply
    948.87x = 1,310.28 × 917.88
  4. Step 4: Simplify right side
    948.87x = 1,202,679.81
  5. Step 5: Solve for x
    x = 1,202,679.81/948.87
  6. Step 6: Final answer
    x = 1,267.49

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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.