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Finding the Fourth Proportional to 113,609, 156,780.96 and 65,890.64

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Solution

The fourth proportional to 113,609, 156,780.96 and 65,890.64 is: 90,929.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,609 : 156,780.96 = 65,890.64 : x
  2. Step 2: Convert to fraction form
    113,609/156,780.96 = 65,890.64/x
  3. Step 3: Cross multiply
    113,609x = 156,780.96 × 65,890.64
  4. Step 4: Simplify right side
    113,609x = 10,330,397,794.21
  5. Step 5: Solve for x
    x = 10,330,397,794.21/113,609
  6. Step 6: Final answer
    x = 90,929.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.