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Finding the Fourth Proportional to 30,963.56, 42,730.56 and 18,217.64

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Solution

The fourth proportional to 30,963.56, 42,730.56 and 18,217.64 is: 25,140.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,963.56 : 42,730.56 = 18,217.64 : x
  2. Step 2: Convert to fraction form
    30,963.56/42,730.56 = 18,217.64/x
  3. Step 3: Cross multiply
    30,963.56x = 42,730.56 × 18,217.64
  4. Step 4: Simplify right side
    30,963.56x = 778,449,959.08
  5. Step 5: Solve for x
    x = 778,449,959.08/30,963.56
  6. Step 6: Final answer
    x = 25,140.84

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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.