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Finding the Fourth Proportional to 18,774.80, 25,878.12 and 13,461.20

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Solution

The fourth proportional to 18,774.80, 25,878.12 and 13,461.20 is: 18,554.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,774.80 : 25,878.12 = 13,461.20 : x
  2. Step 2: Convert to fraction form
    18,774.80/25,878.12 = 13,461.20/x
  3. Step 3: Cross multiply
    18,774.80x = 25,878.12 × 13,461.20
  4. Step 4: Simplify right side
    18,774.80x = 348,350,548.94
  5. Step 5: Solve for x
    x = 348,350,548.94/18,774.80
  6. Step 6: Final answer
    x = 18,554.15

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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.