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Finding the Fourth Proportional to 19,358.80, 29,038.20 and 13,721.20

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Solution

The fourth proportional to 19,358.80, 29,038.20 and 13,721.20 is: 20,581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,358.80 : 29,038.20 = 13,721.20 : x
  2. Step 2: Convert to fraction form
    19,358.80/29,038.20 = 13,721.20/x
  3. Step 3: Cross multiply
    19,358.80x = 29,038.20 × 13,721.20
  4. Step 4: Simplify right side
    19,358.80x = 398,438,949.84
  5. Step 5: Solve for x
    x = 398,438,949.84/19,358.80
  6. Step 6: Final answer
    x = 20,581.80

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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.