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Finding the Fourth Proportional to 102,209.80, 153,314.70 and 66,780.40

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Solution

The fourth proportional to 102,209.80, 153,314.70 and 66,780.40 is: 100,170.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,209.80 : 153,314.70 = 66,780.40 : x
  2. Step 2: Convert to fraction form
    102,209.80/153,314.70 = 66,780.40/x
  3. Step 3: Cross multiply
    102,209.80x = 153,314.70 × 66,780.40
  4. Step 4: Simplify right side
    102,209.80x = 10,238,416,991.88
  5. Step 5: Solve for x
    x = 10,238,416,991.88/102,209.80
  6. Step 6: Final answer
    x = 100,170.60

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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.