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Finding the Fourth Proportional to 28,502.88, 42,759.98 and 8,780.59

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Solution

The fourth proportional to 28,502.88, 42,759.98 and 8,780.59 is: 13,172.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,502.88 : 42,759.98 = 8,780.59 : x
  2. Step 2: Convert to fraction form
    28,502.88/42,759.98 = 8,780.59/x
  3. Step 3: Cross multiply
    28,502.88x = 42,759.98 × 8,780.59
  4. Step 4: Simplify right side
    28,502.88x = 375,457,852.79
  5. Step 5: Solve for x
    x = 375,457,852.79/28,502.88
  6. Step 6: Final answer
    x = 13,172.63

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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.