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Finding the Fourth Proportional to 153,763.91, 212,194.28 and 85,780.88

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Solution

The fourth proportional to 153,763.91, 212,194.28 and 85,780.88 is: 118,377.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,763.91 : 212,194.28 = 85,780.88 : x
  2. Step 2: Convert to fraction form
    153,763.91/212,194.28 = 85,780.88/x
  3. Step 3: Cross multiply
    153,763.91x = 212,194.28 × 85,780.88
  4. Step 4: Simplify right side
    153,763.91x = 18,202,212,369.55
  5. Step 5: Solve for x
    x = 18,202,212,369.55/153,763.91
  6. Step 6: Final answer
    x = 118,377.67

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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.