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Finding the Fourth Proportional to 139,905.20, 209,857.80 and 80,710.40

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Solution

The fourth proportional to 139,905.20, 209,857.80 and 80,710.40 is: 121,065.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,905.20 : 209,857.80 = 80,710.40 : x
  2. Step 2: Convert to fraction form
    139,905.20/209,857.80 = 80,710.40/x
  3. Step 3: Cross multiply
    139,905.20x = 209,857.80 × 80,710.40
  4. Step 4: Simplify right side
    139,905.20x = 16,937,706,981.12
  5. Step 5: Solve for x
    x = 16,937,706,981.12/139,905.20
  6. Step 6: Final answer
    x = 121,065.60

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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.