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Finding the Fourth Proportional to 642,661.80, 963,992.70 and 376,722.60

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Solution

The fourth proportional to 642,661.80, 963,992.70 and 376,722.60 is: 565,083.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,661.80 : 963,992.70 = 376,722.60 : x
  2. Step 2: Convert to fraction form
    642,661.80/963,992.70 = 376,722.60/x
  3. Step 3: Cross multiply
    642,661.80x = 963,992.70 × 376,722.60
  4. Step 4: Simplify right side
    642,661.80x = 363,157,836,325.02
  5. Step 5: Solve for x
    x = 363,157,836,325.02/642,661.80
  6. Step 6: Final answer
    x = 565,083.90

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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.