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Finding the Fourth Proportional to 18,700, 28,008.79 and 15,457.48

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Solution

The fourth proportional to 18,700, 28,008.79 and 15,457.48 is: 23,152.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,700 : 28,008.79 = 15,457.48 : x
  2. Step 2: Convert to fraction form
    18,700/28,008.79 = 15,457.48/x
  3. Step 3: Cross multiply
    18,700x = 28,008.79 × 15,457.48
  4. Step 4: Simplify right side
    18,700x = 432,945,311.25
  5. Step 5: Solve for x
    x = 432,945,311.25/18,700
  6. Step 6: Final answer
    x = 23,152.16

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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.