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Finding the Fourth Proportional to 18,991.68, 28,487.16 and 5,140.68

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Solution

The fourth proportional to 18,991.68, 28,487.16 and 5,140.68 is: 7,710.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.68 : 28,487.16 = 5,140.68 : x
  2. Step 2: Convert to fraction form
    18,991.68/28,487.16 = 5,140.68/x
  3. Step 3: Cross multiply
    18,991.68x = 28,487.16 × 5,140.68
  4. Step 4: Simplify right side
    18,991.68x = 146,443,373.67
  5. Step 5: Solve for x
    x = 146,443,373.67/18,991.68
  6. Step 6: Final answer
    x = 7,710.92

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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.