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Finding the Fourth Proportional to 28,678.90, 43,011.90 and 12,057.70

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Solution

The fourth proportional to 28,678.90, 43,011.90 and 12,057.70 is: 18,083.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,678.90 : 43,011.90 = 12,057.70 : x
  2. Step 2: Convert to fraction form
    28,678.90/43,011.90 = 12,057.70/x
  3. Step 3: Cross multiply
    28,678.90x = 43,011.90 × 12,057.70
  4. Step 4: Simplify right side
    28,678.90x = 518,624,586.63
  5. Step 5: Solve for x
    x = 518,624,586.63/28,678.90
  6. Step 6: Final answer
    x = 18,083.84

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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.