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Finding the Fourth Proportional to 289,721.80, 434,582.70 and 79,359.40

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Solution

The fourth proportional to 289,721.80, 434,582.70 and 79,359.40 is: 119,039.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,721.80 : 434,582.70 = 79,359.40 : x
  2. Step 2: Convert to fraction form
    289,721.80/434,582.70 = 79,359.40/x
  3. Step 3: Cross multiply
    289,721.80x = 434,582.70 × 79,359.40
  4. Step 4: Simplify right side
    289,721.80x = 34,488,222,322.38
  5. Step 5: Solve for x
    x = 34,488,222,322.38/289,721.80
  6. Step 6: Final answer
    x = 119,039.10

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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.