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Finding the Fourth Proportional to 68,130.40, 102,205.20 and 21,378.40

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Solution

The fourth proportional to 68,130.40, 102,205.20 and 21,378.40 is: 32,070.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,130.40 : 102,205.20 = 21,378.40 : x
  2. Step 2: Convert to fraction form
    68,130.40/102,205.20 = 21,378.40/x
  3. Step 3: Cross multiply
    68,130.40x = 102,205.20 × 21,378.40
  4. Step 4: Simplify right side
    68,130.40x = 2,184,983,647.68
  5. Step 5: Solve for x
    x = 2,184,983,647.68/68,130.40
  6. Step 6: Final answer
    x = 32,070.61

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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.