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Finding the Fourth Proportional to 18,603.85, 25,680.05 and 12,318.25

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Solution

The fourth proportional to 18,603.85, 25,680.05 and 12,318.25 is: 17,003.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,603.85 : 25,680.05 = 12,318.25 : x
  2. Step 2: Convert to fraction form
    18,603.85/25,680.05 = 12,318.25/x
  3. Step 3: Cross multiply
    18,603.85x = 25,680.05 × 12,318.25
  4. Step 4: Simplify right side
    18,603.85x = 316,333,242.51
  5. Step 5: Solve for x
    x = 316,333,242.51/18,603.85
  6. Step 6: Final answer
    x = 17,003.65

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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.