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Finding the Fourth Proportional to 28,476.69, 42,719.10 and 8,756.89

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Solution

The fourth proportional to 28,476.69, 42,719.10 and 8,756.89 is: 13,136.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,476.69 : 42,719.10 = 8,756.89 : x
  2. Step 2: Convert to fraction form
    28,476.69/42,719.10 = 8,756.89/x
  3. Step 3: Cross multiply
    28,476.69x = 42,719.10 × 8,756.89
  4. Step 4: Simplify right side
    28,476.69x = 374,086,459.60
  5. Step 5: Solve for x
    x = 374,086,459.60/28,476.69
  6. Step 6: Final answer
    x = 13,136.59

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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.