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Finding the Fourth Proportional to 18,710.28, 25,814.16 and 12,423.90

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Solution

The fourth proportional to 18,710.28, 25,814.16 and 12,423.90 is: 17,140.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,710.28 : 25,814.16 = 12,423.90 : x
  2. Step 2: Convert to fraction form
    18,710.28/25,814.16 = 12,423.90/x
  3. Step 3: Cross multiply
    18,710.28x = 25,814.16 × 12,423.90
  4. Step 4: Simplify right side
    18,710.28x = 320,712,542.42
  5. Step 5: Solve for x
    x = 320,712,542.42/18,710.28
  6. Step 6: Final answer
    x = 17,140.98

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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.