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Finding the Fourth Proportional to 520,087.30, 780,130.95 and 443,979.70

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Solution

The fourth proportional to 520,087.30, 780,130.95 and 443,979.70 is: 665,969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,087.30 : 780,130.95 = 443,979.70 : x
  2. Step 2: Convert to fraction form
    520,087.30/780,130.95 = 443,979.70/x
  3. Step 3: Cross multiply
    520,087.30x = 780,130.95 × 443,979.70
  4. Step 4: Simplify right side
    520,087.30x = 346,362,305,141.72
  5. Step 5: Solve for x
    x = 346,362,305,141.72/520,087.30
  6. Step 6: Final answer
    x = 665,969.55

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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.