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Finding the Fourth Proportional to 28,681.44, 42,992.57 and 20,764.30

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Solution

The fourth proportional to 28,681.44, 42,992.57 and 20,764.30 is: 31,125.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,681.44 : 42,992.57 = 20,764.30 : x
  2. Step 2: Convert to fraction form
    28,681.44/42,992.57 = 20,764.30/x
  3. Step 3: Cross multiply
    28,681.44x = 42,992.57 × 20,764.30
  4. Step 4: Simplify right side
    28,681.44x = 892,710,646.29
  5. Step 5: Solve for x
    x = 892,710,646.29/28,681.44
  6. Step 6: Final answer
    x = 31,125.03

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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.