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Finding the Fourth Proportional to 519,639.80, 779,459.70 and 319,310.60

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Solution

The fourth proportional to 519,639.80, 779,459.70 and 319,310.60 is: 478,965.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,639.80 : 779,459.70 = 319,310.60 : x
  2. Step 2: Convert to fraction form
    519,639.80/779,459.70 = 319,310.60/x
  3. Step 3: Cross multiply
    519,639.80x = 779,459.70 × 319,310.60
  4. Step 4: Simplify right side
    519,639.80x = 248,889,744,482.82
  5. Step 5: Solve for x
    x = 248,889,744,482.82/519,639.80
  6. Step 6: Final answer
    x = 478,965.90

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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.