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Finding the Fourth Proportional to 28,920.65, 43,387.65 and 12,281.22

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Solution

The fourth proportional to 28,920.65, 43,387.65 and 12,281.22 is: 18,424.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920.65 : 43,387.65 = 12,281.22 : x
  2. Step 2: Convert to fraction form
    28,920.65/43,387.65 = 12,281.22/x
  3. Step 3: Cross multiply
    28,920.65x = 43,387.65 × 12,281.22
  4. Step 4: Simplify right side
    28,920.65x = 532,853,274.93
  5. Step 5: Solve for x
    x = 532,853,274.93/28,920.65
  6. Step 6: Final answer
    x = 18,424.67

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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.