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Finding the Fourth Proportional to 128,445.60, 192,668.40 and 102,007.20

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Solution

The fourth proportional to 128,445.60, 192,668.40 and 102,007.20 is: 153,010.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,445.60 : 192,668.40 = 102,007.20 : x
  2. Step 2: Convert to fraction form
    128,445.60/192,668.40 = 102,007.20/x
  3. Step 3: Cross multiply
    128,445.60x = 192,668.40 × 102,007.20
  4. Step 4: Simplify right side
    128,445.60x = 19,653,564,012.48
  5. Step 5: Solve for x
    x = 19,653,564,012.48/128,445.60
  6. Step 6: Final answer
    x = 153,010.80

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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.