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Finding the Fourth Proportional to 13,572.90, 18,739.78 and 8,476.20

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Solution

The fourth proportional to 13,572.90, 18,739.78 and 8,476.20 is: 11,702.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,572.90 : 18,739.78 = 8,476.20 : x
  2. Step 2: Convert to fraction form
    13,572.90/18,739.78 = 8,476.20/x
  3. Step 3: Cross multiply
    13,572.90x = 18,739.78 × 8,476.20
  4. Step 4: Simplify right side
    13,572.90x = 158,842,123.24
  5. Step 5: Solve for x
    x = 158,842,123.24/13,572.90
  6. Step 6: Final answer
    x = 11,702.89

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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.