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Finding the Fourth Proportional to 28,892.70, 39,876.30 and 16,961.40

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Solution

The fourth proportional to 28,892.70, 39,876.30 and 16,961.40 is: 23,409.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,892.70 : 39,876.30 = 16,961.40 : x
  2. Step 2: Convert to fraction form
    28,892.70/39,876.30 = 16,961.40/x
  3. Step 3: Cross multiply
    28,892.70x = 39,876.30 × 16,961.40
  4. Step 4: Simplify right side
    28,892.70x = 676,357,874.82
  5. Step 5: Solve for x
    x = 676,357,874.82/28,892.70
  6. Step 6: Final answer
    x = 23,409.30

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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.