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Finding the Fourth Proportional to 66,905.80, 100,358.70 and 51,159.40

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Solution

The fourth proportional to 66,905.80, 100,358.70 and 51,159.40 is: 76,739.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,905.80 : 100,358.70 = 51,159.40 : x
  2. Step 2: Convert to fraction form
    66,905.80/100,358.70 = 51,159.40/x
  3. Step 3: Cross multiply
    66,905.80x = 100,358.70 × 51,159.40
  4. Step 4: Simplify right side
    66,905.80x = 5,134,290,876.78
  5. Step 5: Solve for x
    x = 5,134,290,876.78/66,905.80
  6. Step 6: Final answer
    x = 76,739.10

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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.