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Finding the Fourth Proportional to 28,508.52, 42,762.78 and 18,709.74

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Solution

The fourth proportional to 28,508.52, 42,762.78 and 18,709.74 is: 28,064.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,508.52 : 42,762.78 = 18,709.74 : x
  2. Step 2: Convert to fraction form
    28,508.52/42,762.78 = 18,709.74/x
  3. Step 3: Cross multiply
    28,508.52x = 42,762.78 × 18,709.74
  4. Step 4: Simplify right side
    28,508.52x = 800,080,495.48
  5. Step 5: Solve for x
    x = 800,080,495.48/28,508.52
  6. Step 6: Final answer
    x = 28,064.61

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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.