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Finding the Fourth Proportional to 18,870.69, 28,309.44 and 7,771.32

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Solution

The fourth proportional to 18,870.69, 28,309.44 and 7,771.32 is: 11,658.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.69 : 28,309.44 = 7,771.32 : x
  2. Step 2: Convert to fraction form
    18,870.69/28,309.44 = 7,771.32/x
  3. Step 3: Cross multiply
    18,870.69x = 28,309.44 × 7,771.32
  4. Step 4: Simplify right side
    18,870.69x = 220,001,717.26
  5. Step 5: Solve for x
    x = 220,001,717.26/18,870.69
  6. Step 6: Final answer
    x = 11,658.38

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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.