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Finding the Fourth Proportional to 128,374.20, 192,302.10 and 72,905.40

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Solution

The fourth proportional to 128,374.20, 192,302.10 and 72,905.40 is: 109,210.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,374.20 : 192,302.10 = 72,905.40 : x
  2. Step 2: Convert to fraction form
    128,374.20/192,302.10 = 72,905.40/x
  3. Step 3: Cross multiply
    128,374.20x = 192,302.10 × 72,905.40
  4. Step 4: Simplify right side
    128,374.20x = 14,019,861,521.34
  5. Step 5: Solve for x
    x = 14,019,861,521.34/128,374.20
  6. Step 6: Final answer
    x = 109,210.90

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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.