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Finding the Fourth Proportional to 219,802.20, 329,703.30 and 129,989.40

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Solution

The fourth proportional to 219,802.20, 329,703.30 and 129,989.40 is: 194,984.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,802.20 : 329,703.30 = 129,989.40 : x
  2. Step 2: Convert to fraction form
    219,802.20/329,703.30 = 129,989.40/x
  3. Step 3: Cross multiply
    219,802.20x = 329,703.30 × 129,989.40
  4. Step 4: Simplify right side
    219,802.20x = 42,857,934,145.02
  5. Step 5: Solve for x
    x = 42,857,934,145.02/219,802.20
  6. Step 6: Final answer
    x = 194,984.10

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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.