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Finding the Fourth Proportional to 553,709.66, 764,131.20 and 308,709.50

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Solution

The fourth proportional to 553,709.66, 764,131.20 and 308,709.50 is: 426,025.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,709.66 : 764,131.20 = 308,709.50 : x
  2. Step 2: Convert to fraction form
    553,709.66/764,131.20 = 308,709.50/x
  3. Step 3: Cross multiply
    553,709.66x = 764,131.20 × 308,709.50
  4. Step 4: Simplify right side
    553,709.66x = 235,894,560,686.40
  5. Step 5: Solve for x
    x = 235,894,560,686.40/553,709.66
  6. Step 6: Final answer
    x = 426,025.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.