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Finding the Fourth Proportional to 128,315.40, 192,254.40 and 109,507.20

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Solution

The fourth proportional to 128,315.40, 192,254.40 and 109,507.20 is: 164,074.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,315.40 : 192,254.40 = 109,507.20 : x
  2. Step 2: Convert to fraction form
    128,315.40/192,254.40 = 109,507.20/x
  3. Step 3: Cross multiply
    128,315.40x = 192,254.40 × 109,507.20
  4. Step 4: Simplify right side
    128,315.40x = 21,053,241,031.68
  5. Step 5: Solve for x
    x = 21,053,241,031.68/128,315.40
  6. Step 6: Final answer
    x = 164,074.16

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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.