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Finding the Fourth Proportional to 18,870.86, 28,281.86 and 7,764.98

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Solution

The fourth proportional to 18,870.86, 28,281.86 and 7,764.98 is: 11,637.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.86 : 28,281.86 = 7,764.98 : x
  2. Step 2: Convert to fraction form
    18,870.86/28,281.86 = 7,764.98/x
  3. Step 3: Cross multiply
    18,870.86x = 28,281.86 × 7,764.98
  4. Step 4: Simplify right side
    18,870.86x = 219,608,077.26
  5. Step 5: Solve for x
    x = 219,608,077.26/18,870.86
  6. Step 6: Final answer
    x = 11,637.42

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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.