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Finding the Fourth Proportional to 1,263.16, 1,742.32 and 821.64

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Solution

The fourth proportional to 1,263.16, 1,742.32 and 821.64 is: 1,133.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.16 : 1,742.32 = 821.64 : x
  2. Step 2: Convert to fraction form
    1,263.16/1,742.32 = 821.64/x
  3. Step 3: Cross multiply
    1,263.16x = 1,742.32 × 821.64
  4. Step 4: Simplify right side
    1,263.16x = 1,431,559.80
  5. Step 5: Solve for x
    x = 1,431,559.80/1,263.16
  6. Step 6: Final answer
    x = 1,133.32

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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.