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Finding the Fourth Proportional to 346,989.40, 520,905.30 and 220,629.40

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Solution

The fourth proportional to 346,989.40, 520,905.30 and 220,629.40 is: 331,211.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    346,989.40 : 520,905.30 = 220,629.40 : x
  2. Step 2: Convert to fraction form
    346,989.40/520,905.30 = 220,629.40/x
  3. Step 3: Cross multiply
    346,989.40x = 520,905.30 × 220,629.40
  4. Step 4: Simplify right side
    346,989.40x = 114,927,023,795.82
  5. Step 5: Solve for x
    x = 114,927,023,795.82/346,989.40
  6. Step 6: Final answer
    x = 331,211.92

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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.