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Finding the Fourth Proportional to 28,360.66, 42,543.15 and 8,640.90

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Solution

The fourth proportional to 28,360.66, 42,543.15 and 8,640.90 is: 12,962.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,360.66 : 42,543.15 = 8,640.90 : x
  2. Step 2: Convert to fraction form
    28,360.66/42,543.15 = 8,640.90/x
  3. Step 3: Cross multiply
    28,360.66x = 42,543.15 × 8,640.90
  4. Step 4: Simplify right side
    28,360.66x = 367,611,104.84
  5. Step 5: Solve for x
    x = 367,611,104.84/28,360.66
  6. Step 6: Final answer
    x = 12,962.01

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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.