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Finding the Fourth Proportional to 139,970.40, 209,892.40 and 40,107.76

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Solution

The fourth proportional to 139,970.40, 209,892.40 and 40,107.76 is: 60,143.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,970.40 : 209,892.40 = 40,107.76 : x
  2. Step 2: Convert to fraction form
    139,970.40/209,892.40 = 40,107.76/x
  3. Step 3: Cross multiply
    139,970.40x = 209,892.40 × 40,107.76
  4. Step 4: Simplify right side
    139,970.40x = 8,418,314,005.02
  5. Step 5: Solve for x
    x = 8,418,314,005.02/139,970.40
  6. Step 6: Final answer
    x = 60,143.53

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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.