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Finding the Fourth Proportional to 20,989, 28,968.06 and 12,603.88

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Solution

The fourth proportional to 20,989, 28,968.06 and 12,603.88 is: 17,395.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989 : 28,968.06 = 12,603.88 : x
  2. Step 2: Convert to fraction form
    20,989/28,968.06 = 12,603.88/x
  3. Step 3: Cross multiply
    20,989x = 28,968.06 × 12,603.88
  4. Step 4: Simplify right side
    20,989x = 365,109,952.07
  5. Step 5: Solve for x
    x = 365,109,952.07/20,989
  6. Step 6: Final answer
    x = 17,395.30

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1.5x scale

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.