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Finding the Fourth Proportional to 13,756.50, 18,988.29 and 8,788.50

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Solution

The fourth proportional to 13,756.50, 18,988.29 and 8,788.50 is: 12,130.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,756.50 : 18,988.29 = 8,788.50 : x
  2. Step 2: Convert to fraction form
    13,756.50/18,988.29 = 8,788.50/x
  3. Step 3: Cross multiply
    13,756.50x = 18,988.29 × 8,788.50
  4. Step 4: Simplify right side
    13,756.50x = 166,878,586.67
  5. Step 5: Solve for x
    x = 166,878,586.67/13,756.50
  6. Step 6: Final answer
    x = 12,130.89

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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.