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Finding the Fourth Proportional to 28,566.40, 42,898.20 and 21,179.20

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Solution

The fourth proportional to 28,566.40, 42,898.20 and 21,179.20 is: 31,804.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,566.40 : 42,898.20 = 21,179.20 : x
  2. Step 2: Convert to fraction form
    28,566.40/42,898.20 = 21,179.20/x
  3. Step 3: Cross multiply
    28,566.40x = 42,898.20 × 21,179.20
  4. Step 4: Simplify right side
    28,566.40x = 908,549,557.44
  5. Step 5: Solve for x
    x = 908,549,557.44/28,566.40
  6. Step 6: Final answer
    x = 31,804.83

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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.