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Finding the Fourth Proportional to 393,355.95, 542,815.44 and 221,277.32

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Solution

The fourth proportional to 393,355.95, 542,815.44 and 221,277.32 is: 305,353.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,355.95 : 542,815.44 = 221,277.32 : x
  2. Step 2: Convert to fraction form
    393,355.95/542,815.44 = 221,277.32/x
  3. Step 3: Cross multiply
    393,355.95x = 542,815.44 × 221,277.32
  4. Step 4: Simplify right side
    393,355.95x = 120,112,748,607.53
  5. Step 5: Solve for x
    x = 120,112,748,607.53/393,355.95
  6. Step 6: Final answer
    x = 305,353.84

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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.