Home / 839,907.20-1,259,860.80-390,478.70

Finding the Fourth Proportional to 839,907.20, 1,259,860.80 and 390,478.70

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Solution

The fourth proportional to 839,907.20, 1,259,860.80 and 390,478.70 is: 585,718.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,907.20 : 1,259,860.80 = 390,478.70 : x
  2. Step 2: Convert to fraction form
    839,907.20/1,259,860.80 = 390,478.70/x
  3. Step 3: Cross multiply
    839,907.20x = 1,259,860.80 × 390,478.70
  4. Step 4: Simplify right side
    839,907.20x = 491,948,807,364.96
  5. Step 5: Solve for x
    x = 491,948,807,364.96/839,907.20
  6. Step 6: Final answer
    x = 585,718.05

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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.