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Finding the Fourth Proportional to 30,190.68, 45,271.44 and 12,655.80

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Solution

The fourth proportional to 30,190.68, 45,271.44 and 12,655.80 is: 18,977.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,190.68 : 45,271.44 = 12,655.80 : x
  2. Step 2: Convert to fraction form
    30,190.68/45,271.44 = 12,655.80/x
  3. Step 3: Cross multiply
    30,190.68x = 45,271.44 × 12,655.80
  4. Step 4: Simplify right side
    30,190.68x = 572,946,290.35
  5. Step 5: Solve for x
    x = 572,946,290.35/30,190.68
  6. Step 6: Final answer
    x = 18,977.59

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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.