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Finding the Fourth Proportional to 18,658.70, 25,705.20 and 12,983.68

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Solution

The fourth proportional to 18,658.70, 25,705.20 and 12,983.68 is: 17,887.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,658.70 : 25,705.20 = 12,983.68 : x
  2. Step 2: Convert to fraction form
    18,658.70/25,705.20 = 12,983.68/x
  3. Step 3: Cross multiply
    18,658.70x = 25,705.20 × 12,983.68
  4. Step 4: Simplify right side
    18,658.70x = 333,748,091.14
  5. Step 5: Solve for x
    x = 333,748,091.14/18,658.70
  6. Step 6: Final answer
    x = 17,887.00

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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.