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Finding the Fourth Proportional to 639,715.80, 958,698.90 and 425,875.80

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Solution

The fourth proportional to 639,715.80, 958,698.90 and 425,875.80 is: 638,231.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,715.80 : 958,698.90 = 425,875.80 : x
  2. Step 2: Convert to fraction form
    639,715.80/958,698.90 = 425,875.80/x
  3. Step 3: Cross multiply
    639,715.80x = 958,698.90 × 425,875.80
  4. Step 4: Simplify right side
    639,715.80x = 408,286,660,996.62
  5. Step 5: Solve for x
    x = 408,286,660,996.62/639,715.80
  6. Step 6: Final answer
    x = 638,231.32

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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.