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Finding the Fourth Proportional to 128,434.60, 192,651.90 and 115,312.60

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Solution

The fourth proportional to 128,434.60, 192,651.90 and 115,312.60 is: 172,968.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,434.60 : 192,651.90 = 115,312.60 : x
  2. Step 2: Convert to fraction form
    128,434.60/192,651.90 = 115,312.60/x
  3. Step 3: Cross multiply
    128,434.60x = 192,651.90 × 115,312.60
  4. Step 4: Simplify right side
    128,434.60x = 22,215,191,483.94
  5. Step 5: Solve for x
    x = 22,215,191,483.94/128,434.60
  6. Step 6: Final answer
    x = 172,968.90

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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.