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Finding the Fourth Proportional to 8,988.42, 12,403.50 and 5,211

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Solution

The fourth proportional to 8,988.42, 12,403.50 and 5,211 is: 7,190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,988.42 : 12,403.50 = 5,211 : x
  2. Step 2: Convert to fraction form
    8,988.42/12,403.50 = 5,211/x
  3. Step 3: Cross multiply
    8,988.42x = 12,403.50 × 5,211
  4. Step 4: Simplify right side
    8,988.42x = 64,634,638.50
  5. Step 5: Solve for x
    x = 64,634,638.50/8,988.42
  6. Step 6: Final answer
    x = 7,190.88

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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.