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Finding the Fourth Proportional to 386,385.60, 578,800.80 and 268,190.40

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Solution

The fourth proportional to 386,385.60, 578,800.80 and 268,190.40 is: 401,745.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,385.60 : 578,800.80 = 268,190.40 : x
  2. Step 2: Convert to fraction form
    386,385.60/578,800.80 = 268,190.40/x
  3. Step 3: Cross multiply
    386,385.60x = 578,800.80 × 268,190.40
  4. Step 4: Simplify right side
    386,385.60x = 155,228,818,072.32
  5. Step 5: Solve for x
    x = 155,228,818,072.32/386,385.60
  6. Step 6: Final answer
    x = 401,745.87

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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.