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Finding the Fourth Proportional to 949.32, 1,311.58 and 810.90

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Solution

The fourth proportional to 949.32, 1,311.58 and 810.90 is: 1,120.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.32 : 1,311.58 = 810.90 : x
  2. Step 2: Convert to fraction form
    949.32/1,311.58 = 810.90/x
  3. Step 3: Cross multiply
    949.32x = 1,311.58 × 810.90
  4. Step 4: Simplify right side
    949.32x = 1,063,560.22
  5. Step 5: Solve for x
    x = 1,063,560.22/949.32
  6. Step 6: Final answer
    x = 1,120.34

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1.5x scale

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.