Home / 509,087.20-763,630.80-426,143.20

Finding the Fourth Proportional to 509,087.20, 763,630.80 and 426,143.20

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Solution

The fourth proportional to 509,087.20, 763,630.80 and 426,143.20 is: 639,214.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,087.20 : 763,630.80 = 426,143.20 : x
  2. Step 2: Convert to fraction form
    509,087.20/763,630.80 = 426,143.20/x
  3. Step 3: Cross multiply
    509,087.20x = 763,630.80 × 426,143.20
  4. Step 4: Simplify right side
    509,087.20x = 325,416,072,730.56
  5. Step 5: Solve for x
    x = 325,416,072,730.56/509,087.20
  6. Step 6: Final answer
    x = 639,214.80

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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.