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Finding the Fourth Proportional to 30,981.08, 42,763.74 and 19,803.08

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Solution

The fourth proportional to 30,981.08, 42,763.74 and 19,803.08 is: 27,334.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,981.08 : 42,763.74 = 19,803.08 : x
  2. Step 2: Convert to fraction form
    30,981.08/42,763.74 = 19,803.08/x
  3. Step 3: Cross multiply
    30,981.08x = 42,763.74 × 19,803.08
  4. Step 4: Simplify right side
    30,981.08x = 846,853,764.32
  5. Step 5: Solve for x
    x = 846,853,764.32/30,981.08
  6. Step 6: Final answer
    x = 27,334.55

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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.