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Finding the Fourth Proportional to 18,673.90, 28,015.80 and 8,139.40

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Solution

The fourth proportional to 18,673.90, 28,015.80 and 8,139.40 is: 12,211.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,673.90 : 28,015.80 = 8,139.40 : x
  2. Step 2: Convert to fraction form
    18,673.90/28,015.80 = 8,139.40/x
  3. Step 3: Cross multiply
    18,673.90x = 28,015.80 × 8,139.40
  4. Step 4: Simplify right side
    18,673.90x = 228,031,802.52
  5. Step 5: Solve for x
    x = 228,031,802.52/18,673.90
  6. Step 6: Final answer
    x = 12,211.26

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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.