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Finding the Fourth Proportional to 18,689.40, 28,049.40 and 18,543.60

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Solution

The fourth proportional to 18,689.40, 28,049.40 and 18,543.60 is: 27,830.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.40 : 28,049.40 = 18,543.60 : x
  2. Step 2: Convert to fraction form
    18,689.40/28,049.40 = 18,543.60/x
  3. Step 3: Cross multiply
    18,689.40x = 28,049.40 × 18,543.60
  4. Step 4: Simplify right side
    18,689.40x = 520,136,853.84
  5. Step 5: Solve for x
    x = 520,136,853.84/18,689.40
  6. Step 6: Final answer
    x = 27,830.58

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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.