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Finding the Fourth Proportional to 20,643.92, 30,970.29 and 6,412.10

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Solution

The fourth proportional to 20,643.92, 30,970.29 and 6,412.10 is: 9,619.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.92 : 30,970.29 = 6,412.10 : x
  2. Step 2: Convert to fraction form
    20,643.92/30,970.29 = 6,412.10/x
  3. Step 3: Cross multiply
    20,643.92x = 30,970.29 × 6,412.10
  4. Step 4: Simplify right side
    20,643.92x = 198,584,441.66
  5. Step 5: Solve for x
    x = 198,584,441.66/20,643.92
  6. Step 6: Final answer
    x = 9,619.51

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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.