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Finding the Fourth Proportional to 18,705.80, 28,058.70 and 12,139.40

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Solution

The fourth proportional to 18,705.80, 28,058.70 and 12,139.40 is: 18,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.80 : 28,058.70 = 12,139.40 : x
  2. Step 2: Convert to fraction form
    18,705.80/28,058.70 = 12,139.40/x
  3. Step 3: Cross multiply
    18,705.80x = 28,058.70 × 12,139.40
  4. Step 4: Simplify right side
    18,705.80x = 340,615,782.78
  5. Step 5: Solve for x
    x = 340,615,782.78/18,705.80
  6. Step 6: Final answer
    x = 18,209.10

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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.