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Finding the Fourth Proportional to 18,959.77, 28,439.81 and 12,427.32

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Solution

The fourth proportional to 18,959.77, 28,439.81 and 12,427.32 is: 18,641.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.77 : 28,439.81 = 12,427.32 : x
  2. Step 2: Convert to fraction form
    18,959.77/28,439.81 = 12,427.32/x
  3. Step 3: Cross multiply
    18,959.77x = 28,439.81 × 12,427.32
  4. Step 4: Simplify right side
    18,959.77x = 353,430,710.72
  5. Step 5: Solve for x
    x = 353,430,710.72/18,959.77
  6. Step 6: Final answer
    x = 18,641.09

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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.