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Finding the Fourth Proportional to 128,436.30, 192,654.45 and 66,228.30

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Solution

The fourth proportional to 128,436.30, 192,654.45 and 66,228.30 is: 99,342.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,436.30 : 192,654.45 = 66,228.30 : x
  2. Step 2: Convert to fraction form
    128,436.30/192,654.45 = 66,228.30/x
  3. Step 3: Cross multiply
    128,436.30x = 192,654.45 × 66,228.30
  4. Step 4: Simplify right side
    128,436.30x = 12,759,176,710.94
  5. Step 5: Solve for x
    x = 12,759,176,710.94/128,436.30
  6. Step 6: Final answer
    x = 99,342.45

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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.