Home / 19,981.80-29,972.70-11,671.20

Finding the Fourth Proportional to 19,981.80, 29,972.70 and 11,671.20

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Solution

The fourth proportional to 19,981.80, 29,972.70 and 11,671.20 is: 17,506.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,981.80 : 29,972.70 = 11,671.20 : x
  2. Step 2: Convert to fraction form
    19,981.80/29,972.70 = 11,671.20/x
  3. Step 3: Cross multiply
    19,981.80x = 29,972.70 × 11,671.20
  4. Step 4: Simplify right side
    19,981.80x = 349,817,376.24
  5. Step 5: Solve for x
    x = 349,817,376.24/19,981.80
  6. Step 6: Final answer
    x = 17,506.80

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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.