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Finding the Fourth Proportional to 31,135.52, 42,969.60 and 21,065.60

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Solution

The fourth proportional to 31,135.52, 42,969.60 and 21,065.60 is: 29,072.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,135.52 : 42,969.60 = 21,065.60 : x
  2. Step 2: Convert to fraction form
    31,135.52/42,969.60 = 21,065.60/x
  3. Step 3: Cross multiply
    31,135.52x = 42,969.60 × 21,065.60
  4. Step 4: Simplify right side
    31,135.52x = 905,180,405.76
  5. Step 5: Solve for x
    x = 905,180,405.76/31,135.52
  6. Step 6: Final answer
    x = 29,072.28

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1.5x scale

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.