Home / 19,929.70-29,858.10-12,129.40

Finding the Fourth Proportional to 19,929.70, 29,858.10 and 12,129.40

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Solution

The fourth proportional to 19,929.70, 29,858.10 and 12,129.40 is: 18,171.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,929.70 : 29,858.10 = 12,129.40 : x
  2. Step 2: Convert to fraction form
    19,929.70/29,858.10 = 12,129.40/x
  3. Step 3: Cross multiply
    19,929.70x = 29,858.10 × 12,129.40
  4. Step 4: Simplify right side
    19,929.70x = 362,160,838.14
  5. Step 5: Solve for x
    x = 362,160,838.14/19,929.70
  6. Step 6: Final answer
    x = 18,171.92

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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.