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Finding the Fourth Proportional to 28,509.10, 42,764.51 and 9,788.87

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Solution

The fourth proportional to 28,509.10, 42,764.51 and 9,788.87 is: 14,683.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,509.10 : 42,764.51 = 9,788.87 : x
  2. Step 2: Convert to fraction form
    28,509.10/42,764.51 = 9,788.87/x
  3. Step 3: Cross multiply
    28,509.10x = 42,764.51 × 9,788.87
  4. Step 4: Simplify right side
    28,509.10x = 418,616,360.39
  5. Step 5: Solve for x
    x = 418,616,360.39/28,509.10
  6. Step 6: Final answer
    x = 14,683.61

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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.