Home / 18,985.81-28,478.73-4,945.80

Finding the Fourth Proportional to 18,985.81, 28,478.73 and 4,945.80

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Solution

The fourth proportional to 18,985.81, 28,478.73 and 4,945.80 is: 7,418.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.81 : 28,478.73 = 4,945.80 : x
  2. Step 2: Convert to fraction form
    18,985.81/28,478.73 = 4,945.80/x
  3. Step 3: Cross multiply
    18,985.81x = 28,478.73 × 4,945.80
  4. Step 4: Simplify right side
    18,985.81x = 140,850,078.11
  5. Step 5: Solve for x
    x = 140,850,078.11/18,985.81
  6. Step 6: Final answer
    x = 7,418.70

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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.