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Finding the Fourth Proportional to 30,509.79, 45,690.17 and 18,806.91

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Solution

The fourth proportional to 30,509.79, 45,690.17 and 18,806.91 is: 28,164.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,509.79 : 45,690.17 = 18,806.91 : x
  2. Step 2: Convert to fraction form
    30,509.79/45,690.17 = 18,806.91/x
  3. Step 3: Cross multiply
    30,509.79x = 45,690.17 × 18,806.91
  4. Step 4: Simplify right side
    30,509.79x = 859,290,821.04
  5. Step 5: Solve for x
    x = 859,290,821.04/30,509.79
  6. Step 6: Final answer
    x = 28,164.43

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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.