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Finding the Fourth Proportional to 128,398.88, 192,685.80 and 45,292.88

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Solution

The fourth proportional to 128,398.88, 192,685.80 and 45,292.88 is: 67,970.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,398.88 : 192,685.80 = 45,292.88 : x
  2. Step 2: Convert to fraction form
    128,398.88/192,685.80 = 45,292.88/x
  3. Step 3: Cross multiply
    128,398.88x = 192,685.80 × 45,292.88
  4. Step 4: Simplify right side
    128,398.88x = 8,727,293,853.68
  5. Step 5: Solve for x
    x = 8,727,293,853.68/128,398.88
  6. Step 6: Final answer
    x = 67,970.17

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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.