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Finding the Fourth Proportional to 28,312.78, 42,469.26 and 8,591.51

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Solution

The fourth proportional to 28,312.78, 42,469.26 and 8,591.51 is: 12,887.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,312.78 : 42,469.26 = 8,591.51 : x
  2. Step 2: Convert to fraction form
    28,312.78/42,469.26 = 8,591.51/x
  3. Step 3: Cross multiply
    28,312.78x = 42,469.26 × 8,591.51
  4. Step 4: Simplify right side
    28,312.78x = 364,875,071.98
  5. Step 5: Solve for x
    x = 364,875,071.98/28,312.78
  6. Step 6: Final answer
    x = 12,887.29

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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.