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Finding the Fourth Proportional to 20,641.78, 28,492.08 and 13,189.78

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Solution

The fourth proportional to 20,641.78, 28,492.08 and 13,189.78 is: 18,206.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.78 : 28,492.08 = 13,189.78 : x
  2. Step 2: Convert to fraction form
    20,641.78/28,492.08 = 13,189.78/x
  3. Step 3: Cross multiply
    20,641.78x = 28,492.08 × 13,189.78
  4. Step 4: Simplify right side
    20,641.78x = 375,804,266.94
  5. Step 5: Solve for x
    x = 375,804,266.94/20,641.78
  6. Step 6: Final answer
    x = 18,206.00

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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.