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Finding the Fourth Proportional to 221,130.40, 331,695.60 and 80,903.20

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Solution

The fourth proportional to 221,130.40, 331,695.60 and 80,903.20 is: 121,354.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,130.40 : 331,695.60 = 80,903.20 : x
  2. Step 2: Convert to fraction form
    221,130.40/331,695.60 = 80,903.20/x
  3. Step 3: Cross multiply
    221,130.40x = 331,695.60 × 80,903.20
  4. Step 4: Simplify right side
    221,130.40x = 26,835,235,465.92
  5. Step 5: Solve for x
    x = 26,835,235,465.92/221,130.40
  6. Step 6: Final answer
    x = 121,354.80

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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.