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Finding the Fourth Proportional to 128,304.30, 192,456.45 and 86,313.90

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Solution

The fourth proportional to 128,304.30, 192,456.45 and 86,313.90 is: 129,470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,304.30 : 192,456.45 = 86,313.90 : x
  2. Step 2: Convert to fraction form
    128,304.30/192,456.45 = 86,313.90/x
  3. Step 3: Cross multiply
    128,304.30x = 192,456.45 × 86,313.90
  4. Step 4: Simplify right side
    128,304.30x = 16,611,666,779.66
  5. Step 5: Solve for x
    x = 16,611,666,779.66/128,304.30
  6. Step 6: Final answer
    x = 129,470.85

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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.