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Finding the Fourth Proportional to 520,099.60, 780,149.40 and 306,648.40

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Solution

The fourth proportional to 520,099.60, 780,149.40 and 306,648.40 is: 459,972.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,099.60 : 780,149.40 = 306,648.40 : x
  2. Step 2: Convert to fraction form
    520,099.60/780,149.40 = 306,648.40/x
  3. Step 3: Cross multiply
    520,099.60x = 780,149.40 × 306,648.40
  4. Step 4: Simplify right side
    520,099.60x = 239,231,565,270.96
  5. Step 5: Solve for x
    x = 239,231,565,270.96/520,099.60
  6. Step 6: Final answer
    x = 459,972.60

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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.