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Finding the Fourth Proportional to 28,321.76, 42,484.21 and 9,345.65

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Solution

The fourth proportional to 28,321.76, 42,484.21 and 9,345.65 is: 14,018.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,321.76 : 42,484.21 = 9,345.65 : x
  2. Step 2: Convert to fraction form
    28,321.76/42,484.21 = 9,345.65/x
  3. Step 3: Cross multiply
    28,321.76x = 42,484.21 × 9,345.65
  4. Step 4: Simplify right side
    28,321.76x = 397,042,321.40
  5. Step 5: Solve for x
    x = 397,042,321.40/28,321.76
  6. Step 6: Final answer
    x = 14,018.98

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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.