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Finding the Fourth Proportional to 390,958.02, 539,492.24 and 218,836.56

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Solution

The fourth proportional to 390,958.02, 539,492.24 and 218,836.56 is: 301,977.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,958.02 : 539,492.24 = 218,836.56 : x
  2. Step 2: Convert to fraction form
    390,958.02/539,492.24 = 218,836.56/x
  3. Step 3: Cross multiply
    390,958.02x = 539,492.24 × 218,836.56
  4. Step 4: Simplify right side
    390,958.02x = 118,060,628,518.48
  5. Step 5: Solve for x
    x = 118,060,628,518.48/390,958.02
  6. Step 6: Final answer
    x = 301,977.76

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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.