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Finding the Fourth Proportional to 128,001.40, 192,002.10 and 72,014.20

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Solution

The fourth proportional to 128,001.40, 192,002.10 and 72,014.20 is: 108,021.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.40 : 192,002.10 = 72,014.20 : x
  2. Step 2: Convert to fraction form
    128,001.40/192,002.10 = 72,014.20/x
  3. Step 3: Cross multiply
    128,001.40x = 192,002.10 × 72,014.20
  4. Step 4: Simplify right side
    128,001.40x = 13,826,877,629.82
  5. Step 5: Solve for x
    x = 13,826,877,629.82/128,001.40
  6. Step 6: Final answer
    x = 108,021.30

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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.