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Finding the Fourth Proportional to 520,099.40, 780,149.10 and 319,770.20

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Solution

The fourth proportional to 520,099.40, 780,149.10 and 319,770.20 is: 479,655.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,099.40 : 780,149.10 = 319,770.20 : x
  2. Step 2: Convert to fraction form
    520,099.40/780,149.10 = 319,770.20/x
  3. Step 3: Cross multiply
    520,099.40x = 780,149.10 × 319,770.20
  4. Step 4: Simplify right side
    520,099.40x = 249,468,433,736.82
  5. Step 5: Solve for x
    x = 249,468,433,736.82/520,099.40
  6. Step 6: Final answer
    x = 479,655.30

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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.