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Finding the Fourth Proportional to 28,402.80, 42,647.40 and 21,836.40

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Solution

The fourth proportional to 28,402.80, 42,647.40 and 21,836.40 is: 32,787.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,402.80 : 42,647.40 = 21,836.40 : x
  2. Step 2: Convert to fraction form
    28,402.80/42,647.40 = 21,836.40/x
  3. Step 3: Cross multiply
    28,402.80x = 42,647.40 × 21,836.40
  4. Step 4: Simplify right side
    28,402.80x = 931,265,685.36
  5. Step 5: Solve for x
    x = 931,265,685.36/28,402.80
  6. Step 6: Final answer
    x = 32,787.81

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1.5x scale

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.