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Finding the Fourth Proportional to 21,719.20, 32,530.20 and 18,803.20

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Solution

The fourth proportional to 21,719.20, 32,530.20 and 18,803.20 is: 28,162.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,719.20 : 32,530.20 = 18,803.20 : x
  2. Step 2: Convert to fraction form
    21,719.20/32,530.20 = 18,803.20/x
  3. Step 3: Cross multiply
    21,719.20x = 32,530.20 × 18,803.20
  4. Step 4: Simplify right side
    21,719.20x = 611,671,856.64
  5. Step 5: Solve for x
    x = 611,671,856.64/21,719.20
  6. Step 6: Final answer
    x = 28,162.72

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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.