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Finding the Fourth Proportional to 147,911.40, 221,715.90 and 72,916.20

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Solution

The fourth proportional to 147,911.40, 221,715.90 and 72,916.20 is: 109,299.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,911.40 : 221,715.90 = 72,916.20 : x
  2. Step 2: Convert to fraction form
    147,911.40/221,715.90 = 72,916.20/x
  3. Step 3: Cross multiply
    147,911.40x = 221,715.90 × 72,916.20
  4. Step 4: Simplify right side
    147,911.40x = 16,166,680,907.58
  5. Step 5: Solve for x
    x = 16,166,680,907.58/147,911.40
  6. Step 6: Final answer
    x = 109,299.76

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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.