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Finding the Fourth Proportional to 28,461.55, 42,688.54 and 8,470.68

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Solution

The fourth proportional to 28,461.55, 42,688.54 and 8,470.68 is: 12,704.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,461.55 : 42,688.54 = 8,470.68 : x
  2. Step 2: Convert to fraction form
    28,461.55/42,688.54 = 8,470.68/x
  3. Step 3: Cross multiply
    28,461.55x = 42,688.54 × 8,470.68
  4. Step 4: Simplify right side
    28,461.55x = 361,600,919.65
  5. Step 5: Solve for x
    x = 361,600,919.65/28,461.55
  6. Step 6: Final answer
    x = 12,704.89

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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.