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Finding the Fourth Proportional to 845.08, 1,264.29 and 640.24

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Solution

The fourth proportional to 845.08, 1,264.29 and 640.24 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.08 : 1,264.29 = 640.24 : x
  2. Step 2: Convert to fraction form
    845.08/1,264.29 = 640.24/x
  3. Step 3: Cross multiply
    845.08x = 1,264.29 × 640.24
  4. Step 4: Simplify right side
    845.08x = 809,449.03
  5. Step 5: Solve for x
    x = 809,449.03/845.08
  6. Step 6: Final answer
    x = 957.84

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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.