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Finding the Fourth Proportional to 869.77, 1,304.66 and 220.51

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Solution

The fourth proportional to 869.77, 1,304.66 and 220.51 is: 330.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.77 : 1,304.66 = 220.51 : x
  2. Step 2: Convert to fraction form
    869.77/1,304.66 = 220.51/x
  3. Step 3: Cross multiply
    869.77x = 1,304.66 × 220.51
  4. Step 4: Simplify right side
    869.77x = 287,682.95
  5. Step 5: Solve for x
    x = 287,682.95/869.77
  6. Step 6: Final answer
    x = 330.76

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Double scale
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1.5x scale

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.