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Finding the Fourth Proportional to 21,451.20, 32,128.20 and 12,703.20

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Solution

The fourth proportional to 21,451.20, 32,128.20 and 12,703.20 is: 19,026.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,451.20 : 32,128.20 = 12,703.20 : x
  2. Step 2: Convert to fraction form
    21,451.20/32,128.20 = 12,703.20/x
  3. Step 3: Cross multiply
    21,451.20x = 32,128.20 × 12,703.20
  4. Step 4: Simplify right side
    21,451.20x = 408,130,950.24
  5. Step 5: Solve for x
    x = 408,130,950.24/21,451.20
  6. Step 6: Final answer
    x = 19,026.02

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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.