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Finding the Fourth Proportional to 13,920.65, 20,887.19 and 6,420.18

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Solution

The fourth proportional to 13,920.65, 20,887.19 and 6,420.18 is: 9,633.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.65 : 20,887.19 = 6,420.18 : x
  2. Step 2: Convert to fraction form
    13,920.65/20,887.19 = 6,420.18/x
  3. Step 3: Cross multiply
    13,920.65x = 20,887.19 × 6,420.18
  4. Step 4: Simplify right side
    13,920.65x = 134,099,476.46
  5. Step 5: Solve for x
    x = 134,099,476.46/13,920.65
  6. Step 6: Final answer
    x = 9,633.13

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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.