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Finding the Fourth Proportional to 128,311.40, 192,467.10 and 97,207.40

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Solution

The fourth proportional to 128,311.40, 192,467.10 and 97,207.40 is: 145,811.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,311.40 : 192,467.10 = 97,207.40 : x
  2. Step 2: Convert to fraction form
    128,311.40/192,467.10 = 97,207.40/x
  3. Step 3: Cross multiply
    128,311.40x = 192,467.10 × 97,207.40
  4. Step 4: Simplify right side
    128,311.40x = 18,709,226,376.54
  5. Step 5: Solve for x
    x = 18,709,226,376.54/128,311.40
  6. Step 6: Final answer
    x = 145,811.10

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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.