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Finding the Fourth Proportional to 42,810.42, 64,219.41 and 11,220.42

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Solution

The fourth proportional to 42,810.42, 64,219.41 and 11,220.42 is: 16,831.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,810.42 : 64,219.41 = 11,220.42 : x
  2. Step 2: Convert to fraction form
    42,810.42/64,219.41 = 11,220.42/x
  3. Step 3: Cross multiply
    42,810.42x = 64,219.41 × 11,220.42
  4. Step 4: Simplify right side
    42,810.42x = 720,568,752.35
  5. Step 5: Solve for x
    x = 720,568,752.35/42,810.42
  6. Step 6: Final answer
    x = 16,831.62

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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.