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Finding the Fourth Proportional to 19,139.20, 28,660.20 and 18,264.40

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Solution

The fourth proportional to 19,139.20, 28,660.20 and 18,264.40 is: 27,350.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,139.20 : 28,660.20 = 18,264.40 : x
  2. Step 2: Convert to fraction form
    19,139.20/28,660.20 = 18,264.40/x
  3. Step 3: Cross multiply
    19,139.20x = 28,660.20 × 18,264.40
  4. Step 4: Simplify right side
    19,139.20x = 523,461,356.88
  5. Step 5: Solve for x
    x = 523,461,356.88/19,139.20
  6. Step 6: Final answer
    x = 27,350.22

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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.