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Finding the Fourth Proportional to 18,739.48, 28,109.21 and 4,888.48

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Solution

The fourth proportional to 18,739.48, 28,109.21 and 4,888.48 is: 7,332.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739.48 : 28,109.21 = 4,888.48 : x
  2. Step 2: Convert to fraction form
    18,739.48/28,109.21 = 4,888.48/x
  3. Step 3: Cross multiply
    18,739.48x = 28,109.21 × 4,888.48
  4. Step 4: Simplify right side
    18,739.48x = 137,411,237.95
  5. Step 5: Solve for x
    x = 137,411,237.95/18,739.48
  6. Step 6: Final answer
    x = 7,332.71

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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.