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Finding the Fourth Proportional to 520,015.30, 780,022.95 and 425,536.90

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Solution

The fourth proportional to 520,015.30, 780,022.95 and 425,536.90 is: 638,305.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,015.30 : 780,022.95 = 425,536.90 : x
  2. Step 2: Convert to fraction form
    520,015.30/780,022.95 = 425,536.90/x
  3. Step 3: Cross multiply
    520,015.30x = 780,022.95 × 425,536.90
  4. Step 4: Simplify right side
    520,015.30x = 331,928,548,071.86
  5. Step 5: Solve for x
    x = 331,928,548,071.86/520,015.30
  6. Step 6: Final answer
    x = 638,305.35

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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.