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Finding the Fourth Proportional to 128,467.60, 192,701.40 and 115,345.60

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Solution

The fourth proportional to 128,467.60, 192,701.40 and 115,345.60 is: 173,018.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,467.60 : 192,701.40 = 115,345.60 : x
  2. Step 2: Convert to fraction form
    128,467.60/192,701.40 = 115,345.60/x
  3. Step 3: Cross multiply
    128,467.60x = 192,701.40 × 115,345.60
  4. Step 4: Simplify right side
    128,467.60x = 22,227,258,603.84
  5. Step 5: Solve for x
    x = 22,227,258,603.84/128,467.60
  6. Step 6: Final answer
    x = 173,018.40

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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.