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Finding the Fourth Proportional to 639,703.20, 959,554.80 and 324,775.20

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Solution

The fourth proportional to 639,703.20, 959,554.80 and 324,775.20 is: 487,162.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,703.20 : 959,554.80 = 324,775.20 : x
  2. Step 2: Convert to fraction form
    639,703.20/959,554.80 = 324,775.20/x
  3. Step 3: Cross multiply
    639,703.20x = 959,554.80 × 324,775.20
  4. Step 4: Simplify right side
    639,703.20x = 311,639,602,080.96
  5. Step 5: Solve for x
    x = 311,639,602,080.96/639,703.20
  6. Step 6: Final answer
    x = 487,162.80

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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.