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Finding the Fourth Proportional to 20,572.88, 28,391.10 and 12,619.48

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Solution

The fourth proportional to 20,572.88, 28,391.10 and 12,619.48 is: 17,415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.88 : 28,391.10 = 12,619.48 : x
  2. Step 2: Convert to fraction form
    20,572.88/28,391.10 = 12,619.48/x
  3. Step 3: Cross multiply
    20,572.88x = 28,391.10 × 12,619.48
  4. Step 4: Simplify right side
    20,572.88x = 358,280,918.63
  5. Step 5: Solve for x
    x = 358,280,918.63/20,572.88
  6. Step 6: Final answer
    x = 17,415.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.