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Finding the Fourth Proportional to 520,014.60, 780,021.90 and 253,945.80

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Solution

The fourth proportional to 520,014.60, 780,021.90 and 253,945.80 is: 380,918.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,014.60 : 780,021.90 = 253,945.80 : x
  2. Step 2: Convert to fraction form
    520,014.60/780,021.90 = 253,945.80/x
  3. Step 3: Cross multiply
    520,014.60x = 780,021.90 × 253,945.80
  4. Step 4: Simplify right side
    520,014.60x = 198,083,285,413.02
  5. Step 5: Solve for x
    x = 198,083,285,413.02/520,014.60
  6. Step 6: Final answer
    x = 380,918.70

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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.