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Finding the Fourth Proportional to 128,051.40, 191,639.70 and 117,553.80

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Solution

The fourth proportional to 128,051.40, 191,639.70 and 117,553.80 is: 175,929.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.40 : 191,639.70 = 117,553.80 : x
  2. Step 2: Convert to fraction form
    128,051.40/191,639.70 = 117,553.80/x
  3. Step 3: Cross multiply
    128,051.40x = 191,639.70 × 117,553.80
  4. Step 4: Simplify right side
    128,051.40x = 22,527,974,965.86
  5. Step 5: Solve for x
    x = 22,527,974,965.86/128,051.40
  6. Step 6: Final answer
    x = 175,929.16

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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.