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Finding the Fourth Proportional to 28,516.77, 42,779.77 and 8,790.71

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Solution

The fourth proportional to 28,516.77, 42,779.77 and 8,790.71 is: 13,187.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,516.77 : 42,779.77 = 8,790.71 : x
  2. Step 2: Convert to fraction form
    28,516.77/42,779.77 = 8,790.71/x
  3. Step 3: Cross multiply
    28,516.77x = 42,779.77 × 8,790.71
  4. Step 4: Simplify right side
    28,516.77x = 376,064,761.90
  5. Step 5: Solve for x
    x = 376,064,761.90/28,516.77
  6. Step 6: Final answer
    x = 13,187.49

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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.