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Finding the Fourth Proportional to 520,903.80, 781,355.70 and 126,919.80

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Solution

The fourth proportional to 520,903.80, 781,355.70 and 126,919.80 is: 190,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,903.80 : 781,355.70 = 126,919.80 : x
  2. Step 2: Convert to fraction form
    520,903.80/781,355.70 = 126,919.80/x
  3. Step 3: Cross multiply
    520,903.80x = 781,355.70 × 126,919.80
  4. Step 4: Simplify right side
    520,903.80x = 99,169,509,172.86
  5. Step 5: Solve for x
    x = 99,169,509,172.86/520,903.80
  6. Step 6: Final answer
    x = 190,379.70

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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.