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Finding the Fourth Proportional to 18,973.56, 28,456.98 and 5,123.64

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Solution

The fourth proportional to 18,973.56, 28,456.98 and 5,123.64 is: 7,684.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,973.56 : 28,456.98 = 5,123.64 : x
  2. Step 2: Convert to fraction form
    18,973.56/28,456.98 = 5,123.64/x
  3. Step 3: Cross multiply
    18,973.56x = 28,456.98 × 5,123.64
  4. Step 4: Simplify right side
    18,973.56x = 145,803,321.01
  5. Step 5: Solve for x
    x = 145,803,321.01/18,973.56
  6. Step 6: Final answer
    x = 7,684.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.