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Finding the Fourth Proportional to 218,672.70, 328,009.05 and 147,813.90

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Solution

The fourth proportional to 218,672.70, 328,009.05 and 147,813.90 is: 221,720.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,672.70 : 328,009.05 = 147,813.90 : x
  2. Step 2: Convert to fraction form
    218,672.70/328,009.05 = 147,813.90/x
  3. Step 3: Cross multiply
    218,672.70x = 328,009.05 × 147,813.90
  4. Step 4: Simplify right side
    218,672.70x = 48,484,296,915.80
  5. Step 5: Solve for x
    x = 48,484,296,915.80/218,672.70
  6. Step 6: Final answer
    x = 221,720.85

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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.