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Finding the Fourth Proportional to 839,920.20, 1,259,880.30 and 520,326.60

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Solution

The fourth proportional to 839,920.20, 1,259,880.30 and 520,326.60 is: 780,489.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,920.20 : 1,259,880.30 = 520,326.60 : x
  2. Step 2: Convert to fraction form
    839,920.20/1,259,880.30 = 520,326.60/x
  3. Step 3: Cross multiply
    839,920.20x = 1,259,880.30 × 520,326.60
  4. Step 4: Simplify right side
    839,920.20x = 655,549,232,905.98
  5. Step 5: Solve for x
    x = 655,549,232,905.98/839,920.20
  6. Step 6: Final answer
    x = 780,489.90

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Double scale
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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.