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Finding the Fourth Proportional to 289,339.20, 434,008.80 and 78,998.40

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Solution

The fourth proportional to 289,339.20, 434,008.80 and 78,998.40 is: 118,497.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,339.20 : 434,008.80 = 78,998.40 : x
  2. Step 2: Convert to fraction form
    289,339.20/434,008.80 = 78,998.40/x
  3. Step 3: Cross multiply
    289,339.20x = 434,008.80 × 78,998.40
  4. Step 4: Simplify right side
    289,339.20x = 34,286,000,785.92
  5. Step 5: Solve for x
    x = 34,286,000,785.92/289,339.20
  6. Step 6: Final answer
    x = 118,497.60

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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.