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Finding the Fourth Proportional to 28,425.81, 42,638.82 and 8,704.28

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Solution

The fourth proportional to 28,425.81, 42,638.82 and 8,704.28 is: 13,056.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425.81 : 42,638.82 = 8,704.28 : x
  2. Step 2: Convert to fraction form
    28,425.81/42,638.82 = 8,704.28/x
  3. Step 3: Cross multiply
    28,425.81x = 42,638.82 × 8,704.28
  4. Step 4: Simplify right side
    28,425.81x = 371,140,184.63
  5. Step 5: Solve for x
    x = 371,140,184.63/28,425.81
  6. Step 6: Final answer
    x = 13,056.45

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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.