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Finding the Fourth Proportional to 103,511.40, 155,265.90 and 72,990.84

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Solution

The fourth proportional to 103,511.40, 155,265.90 and 72,990.84 is: 109,485.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,511.40 : 155,265.90 = 72,990.84 : x
  2. Step 2: Convert to fraction form
    103,511.40/155,265.90 = 72,990.84/x
  3. Step 3: Cross multiply
    103,511.40x = 155,265.90 × 72,990.84
  4. Step 4: Simplify right side
    103,511.40x = 11,332,988,464.36
  5. Step 5: Solve for x
    x = 11,332,988,464.36/103,511.40
  6. Step 6: Final answer
    x = 109,485.41

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1.5x scale

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.