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Finding the Fourth Proportional to 42,811.80, 64,217.70 and 11,221.80

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Solution

The fourth proportional to 42,811.80, 64,217.70 and 11,221.80 is: 16,832.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,811.80 : 64,217.70 = 11,221.80 : x
  2. Step 2: Convert to fraction form
    42,811.80/64,217.70 = 11,221.80/x
  3. Step 3: Cross multiply
    42,811.80x = 64,217.70 × 11,221.80
  4. Step 4: Simplify right side
    42,811.80x = 720,638,185.86
  5. Step 5: Solve for x
    x = 720,638,185.86/42,811.80
  6. Step 6: Final answer
    x = 16,832.70

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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.