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Finding the Fourth Proportional to 289,780.80, 434,671.20 and 79,418.40

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Solution

The fourth proportional to 289,780.80, 434,671.20 and 79,418.40 is: 119,127.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,780.80 : 434,671.20 = 79,418.40 : x
  2. Step 2: Convert to fraction form
    289,780.80/434,671.20 = 79,418.40/x
  3. Step 3: Cross multiply
    289,780.80x = 434,671.20 × 79,418.40
  4. Step 4: Simplify right side
    289,780.80x = 34,520,891,230.08
  5. Step 5: Solve for x
    x = 34,520,891,230.08/289,780.80
  6. Step 6: Final answer
    x = 119,127.60

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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.