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Finding the Fourth Proportional to 20,700.94, 28,551.88 and 13,140.70

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Solution

The fourth proportional to 20,700.94, 28,551.88 and 13,140.70 is: 18,124.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.94 : 28,551.88 = 13,140.70 : x
  2. Step 2: Convert to fraction form
    20,700.94/28,551.88 = 13,140.70/x
  3. Step 3: Cross multiply
    20,700.94x = 28,551.88 × 13,140.70
  4. Step 4: Simplify right side
    20,700.94x = 375,191,689.52
  5. Step 5: Solve for x
    x = 375,191,689.52/20,700.94
  6. Step 6: Final answer
    x = 18,124.38

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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.