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Finding the Fourth Proportional to 109,218.80, 163,828.20 and 42,661.10

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Solution

The fourth proportional to 109,218.80, 163,828.20 and 42,661.10 is: 63,991.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,218.80 : 163,828.20 = 42,661.10 : x
  2. Step 2: Convert to fraction form
    109,218.80/163,828.20 = 42,661.10/x
  3. Step 3: Cross multiply
    109,218.80x = 163,828.20 × 42,661.10
  4. Step 4: Simplify right side
    109,218.80x = 6,989,091,223.02
  5. Step 5: Solve for x
    x = 6,989,091,223.02/109,218.80
  6. Step 6: Final answer
    x = 63,991.65

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Similar ratio
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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.