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Finding the Fourth Proportional to 15,987, 23,989.14 and 7,779

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Solution

The fourth proportional to 15,987, 23,989.14 and 7,779 is: 11,672.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,987 : 23,989.14 = 7,779 : x
  2. Step 2: Convert to fraction form
    15,987/23,989.14 = 7,779/x
  3. Step 3: Cross multiply
    15,987x = 23,989.14 × 7,779
  4. Step 4: Simplify right side
    15,987x = 186,611,520.06
  5. Step 5: Solve for x
    x = 186,611,520.06/15,987
  6. Step 6: Final answer
    x = 11,672.70

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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.