Home / 18,918.95-28,378.35-5,771.28

Finding the Fourth Proportional to 18,918.95, 28,378.35 and 5,771.28

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Solution

The fourth proportional to 18,918.95, 28,378.35 and 5,771.28 is: 8,656.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.95 : 28,378.35 = 5,771.28 : x
  2. Step 2: Convert to fraction form
    18,918.95/28,378.35 = 5,771.28/x
  3. Step 3: Cross multiply
    18,918.95x = 28,378.35 × 5,771.28
  4. Step 4: Simplify right side
    18,918.95x = 163,779,403.79
  5. Step 5: Solve for x
    x = 163,779,403.79/18,918.95
  6. Step 6: Final answer
    x = 8,656.90

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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.