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Finding the Fourth Proportional to 1,221.29, 1,682.58 and 902.35

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Solution

The fourth proportional to 1,221.29, 1,682.58 and 902.35 is: 1,243.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.29 : 1,682.58 = 902.35 : x
  2. Step 2: Convert to fraction form
    1,221.29/1,682.58 = 902.35/x
  3. Step 3: Cross multiply
    1,221.29x = 1,682.58 × 902.35
  4. Step 4: Simplify right side
    1,221.29x = 1,518,281.55
  5. Step 5: Solve for x
    x = 1,518,281.55/1,221.29
  6. Step 6: Final answer
    x = 1,243.18

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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.