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Finding the Fourth Proportional to 519,409.80, 779,114.70 and 319,080.60

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Solution

The fourth proportional to 519,409.80, 779,114.70 and 319,080.60 is: 478,620.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,409.80 : 779,114.70 = 319,080.60 : x
  2. Step 2: Convert to fraction form
    519,409.80/779,114.70 = 319,080.60/x
  3. Step 3: Cross multiply
    519,409.80x = 779,114.70 × 319,080.60
  4. Step 4: Simplify right side
    519,409.80x = 248,600,385,944.82
  5. Step 5: Solve for x
    x = 248,600,385,944.82/519,409.80
  6. Step 6: Final answer
    x = 478,620.90

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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.