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Finding the Fourth Proportional to 902.84, 1,344.64 and 842.72

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Solution

The fourth proportional to 902.84, 1,344.64 and 842.72 is: 1,255.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.84 : 1,344.64 = 842.72 : x
  2. Step 2: Convert to fraction form
    902.84/1,344.64 = 842.72/x
  3. Step 3: Cross multiply
    902.84x = 1,344.64 × 842.72
  4. Step 4: Simplify right side
    902.84x = 1,133,155.02
  5. Step 5: Solve for x
    x = 1,133,155.02/902.84
  6. Step 6: Final answer
    x = 1,255.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.