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Finding the Fourth Proportional to 19,319.20, 28,978.80 and 15,560.80

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Solution

The fourth proportional to 19,319.20, 28,978.80 and 15,560.80 is: 23,341.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,319.20 : 28,978.80 = 15,560.80 : x
  2. Step 2: Convert to fraction form
    19,319.20/28,978.80 = 15,560.80/x
  3. Step 3: Cross multiply
    19,319.20x = 28,978.80 × 15,560.80
  4. Step 4: Simplify right side
    19,319.20x = 450,933,311.04
  5. Step 5: Solve for x
    x = 450,933,311.04/19,319.20
  6. Step 6: Final answer
    x = 23,341.20

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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.