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Finding the Fourth Proportional to 28,636.83, 42,939.45 and 8,643.60

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Solution

The fourth proportional to 28,636.83, 42,939.45 and 8,643.60 is: 12,960.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.83 : 42,939.45 = 8,643.60 : x
  2. Step 2: Convert to fraction form
    28,636.83/42,939.45 = 8,643.60/x
  3. Step 3: Cross multiply
    28,636.83x = 42,939.45 × 8,643.60
  4. Step 4: Simplify right side
    28,636.83x = 371,151,430.02
  5. Step 5: Solve for x
    x = 371,151,430.02/28,636.83
  6. Step 6: Final answer
    x = 12,960.63

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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.