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Finding the Fourth Proportional to 20,897.28, 28,840.28 and 11,943.08

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Solution

The fourth proportional to 20,897.28, 28,840.28 and 11,943.08 is: 16,482.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.28 : 28,840.28 = 11,943.08 : x
  2. Step 2: Convert to fraction form
    20,897.28/28,840.28 = 11,943.08/x
  3. Step 3: Cross multiply
    20,897.28x = 28,840.28 × 11,943.08
  4. Step 4: Simplify right side
    20,897.28x = 344,441,567.35
  5. Step 5: Solve for x
    x = 344,441,567.35/20,897.28
  6. Step 6: Final answer
    x = 16,482.60

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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.