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Finding the Fourth Proportional to 639,991.60, 959,987.40 and 630,660.40

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Solution

The fourth proportional to 639,991.60, 959,987.40 and 630,660.40 is: 945,990.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,991.60 : 959,987.40 = 630,660.40 : x
  2. Step 2: Convert to fraction form
    639,991.60/959,987.40 = 630,660.40/x
  3. Step 3: Cross multiply
    639,991.60x = 959,987.40 × 630,660.40
  4. Step 4: Simplify right side
    639,991.60x = 605,426,037,678.96
  5. Step 5: Solve for x
    x = 605,426,037,678.96/639,991.60
  6. Step 6: Final answer
    x = 945,990.60

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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.