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Finding the Fourth Proportional to 171,981.80, 257,972.70 and 129,991.40

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Solution

The fourth proportional to 171,981.80, 257,972.70 and 129,991.40 is: 194,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,981.80 : 257,972.70 = 129,991.40 : x
  2. Step 2: Convert to fraction form
    171,981.80/257,972.70 = 129,991.40/x
  3. Step 3: Cross multiply
    171,981.80x = 257,972.70 × 129,991.40
  4. Step 4: Simplify right side
    171,981.80x = 33,534,232,434.78
  5. Step 5: Solve for x
    x = 33,534,232,434.78/171,981.80
  6. Step 6: Final answer
    x = 194,987.10

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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.