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Finding the Fourth Proportional to 520,430.56, 780,908.16 and 205,113.76

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Solution

The fourth proportional to 520,430.56, 780,908.16 and 205,113.76 is: 307,774.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,430.56 : 780,908.16 = 205,113.76 : x
  2. Step 2: Convert to fraction form
    520,430.56/780,908.16 = 205,113.76/x
  3. Step 3: Cross multiply
    520,430.56x = 780,908.16 × 205,113.76
  4. Step 4: Simplify right side
    520,430.56x = 160,175,008,912.28
  5. Step 5: Solve for x
    x = 160,175,008,912.28/520,430.56
  6. Step 6: Final answer
    x = 307,774.03

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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.