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Finding the Fourth Proportional to 35.63, 53.45 and 12.80

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Solution

The fourth proportional to 35.63, 53.45 and 12.80 is: 19.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.63 : 53.45 = 12.80 : x
  2. Step 2: Convert to fraction form
    35.63/53.45 = 12.80/x
  3. Step 3: Cross multiply
    35.63x = 53.45 × 12.80
  4. Step 4: Simplify right side
    35.63x = 684.23
  5. Step 5: Solve for x
    x = 684.23/35.63
  6. Step 6: Final answer
    x = 19.20

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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.