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Finding the Fourth Proportional to 520,615.40, 780,923.10 and 310,490.60

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Solution

The fourth proportional to 520,615.40, 780,923.10 and 310,490.60 is: 465,735.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,615.40 : 780,923.10 = 310,490.60 : x
  2. Step 2: Convert to fraction form
    520,615.40/780,923.10 = 310,490.60/x
  3. Step 3: Cross multiply
    520,615.40x = 780,923.10 × 310,490.60
  4. Step 4: Simplify right side
    520,615.40x = 242,469,281,872.86
  5. Step 5: Solve for x
    x = 242,469,281,872.86/520,615.40
  6. Step 6: Final answer
    x = 465,735.90

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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.