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Finding the Fourth Proportional to 109,168.20, 163,838.70 and 42,640.20

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Solution

The fourth proportional to 109,168.20, 163,838.70 and 42,640.20 is: 63,994.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,168.20 : 163,838.70 = 42,640.20 : x
  2. Step 2: Convert to fraction form
    109,168.20/163,838.70 = 42,640.20/x
  3. Step 3: Cross multiply
    109,168.20x = 163,838.70 × 42,640.20
  4. Step 4: Simplify right side
    109,168.20x = 6,986,114,935.74
  5. Step 5: Solve for x
    x = 6,986,114,935.74/109,168.20
  6. Step 6: Final answer
    x = 63,994.05

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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.