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Finding the Fourth Proportional to 18,870.80, 28,295.25 and 7,764.93

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Solution

The fourth proportional to 18,870.80, 28,295.25 and 7,764.93 is: 11,642.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.80 : 28,295.25 = 7,764.93 : x
  2. Step 2: Convert to fraction form
    18,870.80/28,295.25 = 7,764.93/x
  3. Step 3: Cross multiply
    18,870.80x = 28,295.25 × 7,764.93
  4. Step 4: Simplify right side
    18,870.80x = 219,710,635.58
  5. Step 5: Solve for x
    x = 219,710,635.58/18,870.80
  6. Step 6: Final answer
    x = 11,642.89

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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.