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Finding the Fourth Proportional to 138,990.50, 191,806.86 and 75,328.30

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Solution

The fourth proportional to 138,990.50, 191,806.86 and 75,328.30 is: 103,953.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,990.50 : 191,806.86 = 75,328.30 : x
  2. Step 2: Convert to fraction form
    138,990.50/191,806.86 = 75,328.30/x
  3. Step 3: Cross multiply
    138,990.50x = 191,806.86 × 75,328.30
  4. Step 4: Simplify right side
    138,990.50x = 14,448,484,692.14
  5. Step 5: Solve for x
    x = 14,448,484,692.14/138,990.50
  6. Step 6: Final answer
    x = 103,953.04

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1.5x scale

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.