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Finding the Fourth Proportional to 212,501.28, 318,688.56 and 72,228

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Solution

The fourth proportional to 212,501.28, 318,688.56 and 72,228 is: 108,320.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,501.28 : 318,688.56 = 72,228 : x
  2. Step 2: Convert to fraction form
    212,501.28/318,688.56 = 72,228/x
  3. Step 3: Cross multiply
    212,501.28x = 318,688.56 × 72,228
  4. Step 4: Simplify right side
    212,501.28x = 23,018,237,311.68
  5. Step 5: Solve for x
    x = 23,018,237,311.68/212,501.28
  6. Step 6: Final answer
    x = 108,320.46

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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.