Home / 18,877.56-28,319.75-7,778.07

Finding the Fourth Proportional to 18,877.56, 28,319.75 and 7,778.07

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Solution

The fourth proportional to 18,877.56, 28,319.75 and 7,778.07 is: 11,668.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,877.56 : 28,319.75 = 7,778.07 : x
  2. Step 2: Convert to fraction form
    18,877.56/28,319.75 = 7,778.07/x
  3. Step 3: Cross multiply
    18,877.56x = 28,319.75 × 7,778.07
  4. Step 4: Simplify right side
    18,877.56x = 220,272,988.16
  5. Step 5: Solve for x
    x = 220,272,988.16/18,877.56
  6. Step 6: Final answer
    x = 11,668.51

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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.