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Finding the Fourth Proportional to 128,019.20, 179,411.20 and 128,019.20

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Solution

The fourth proportional to 128,019.20, 179,411.20 and 128,019.20 is: 179,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,019.20 : 179,411.20 = 128,019.20 : x
  2. Step 2: Convert to fraction form
    128,019.20/179,411.20 = 128,019.20/x
  3. Step 3: Cross multiply
    128,019.20x = 179,411.20 × 128,019.20
  4. Step 4: Simplify right side
    128,019.20x = 22,968,078,295.04
  5. Step 5: Solve for x
    x = 22,968,078,295.04/128,019.20
  6. Step 6: Final answer
    x = 179,411.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.