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Finding the Fourth Proportional to 18,995.28, 28,486.44 and 7,312.56

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Solution

The fourth proportional to 18,995.28, 28,486.44 and 7,312.56 is: 10,966.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.28 : 28,486.44 = 7,312.56 : x
  2. Step 2: Convert to fraction form
    18,995.28/28,486.44 = 7,312.56/x
  3. Step 3: Cross multiply
    18,995.28x = 28,486.44 × 7,312.56
  4. Step 4: Simplify right side
    18,995.28x = 208,308,801.69
  5. Step 5: Solve for x
    x = 208,308,801.69/18,995.28
  6. Step 6: Final answer
    x = 10,966.35

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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.