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Finding the Fourth Proportional to 520,057.80, 780,086.70 and 429,856.20

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Solution

The fourth proportional to 520,057.80, 780,086.70 and 429,856.20 is: 644,784.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,057.80 : 780,086.70 = 429,856.20 : x
  2. Step 2: Convert to fraction form
    520,057.80/780,086.70 = 429,856.20/x
  3. Step 3: Cross multiply
    520,057.80x = 780,086.70 × 429,856.20
  4. Step 4: Simplify right side
    520,057.80x = 335,325,104,532.54
  5. Step 5: Solve for x
    x = 335,325,104,532.54/520,057.80
  6. Step 6: Final answer
    x = 644,784.30

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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.