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Finding the Fourth Proportional to 18,715.29, 28,064.70 and 7,020.31

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Solution

The fourth proportional to 18,715.29, 28,064.70 and 7,020.31 is: 10,527.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.29 : 28,064.70 = 7,020.31 : x
  2. Step 2: Convert to fraction form
    18,715.29/28,064.70 = 7,020.31/x
  3. Step 3: Cross multiply
    18,715.29x = 28,064.70 × 7,020.31
  4. Step 4: Simplify right side
    18,715.29x = 197,022,894.06
  5. Step 5: Solve for x
    x = 197,022,894.06/18,715.29
  6. Step 6: Final answer
    x = 10,527.38

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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.