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Finding the Fourth Proportional to 660,139.80, 990,209.70 and 161,503.80

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Solution

The fourth proportional to 660,139.80, 990,209.70 and 161,503.80 is: 242,255.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,139.80 : 990,209.70 = 161,503.80 : x
  2. Step 2: Convert to fraction form
    660,139.80/990,209.70 = 161,503.80/x
  3. Step 3: Cross multiply
    660,139.80x = 990,209.70 × 161,503.80
  4. Step 4: Simplify right side
    660,139.80x = 159,922,629,346.86
  5. Step 5: Solve for x
    x = 159,922,629,346.86/660,139.80
  6. Step 6: Final answer
    x = 242,255.70

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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.