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Finding the Fourth Proportional to 130,191.72, 179,656.06 and 72,821.10

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Solution

The fourth proportional to 130,191.72, 179,656.06 and 72,821.10 is: 100,488.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,191.72 : 179,656.06 = 72,821.10 : x
  2. Step 2: Convert to fraction form
    130,191.72/179,656.06 = 72,821.10/x
  3. Step 3: Cross multiply
    130,191.72x = 179,656.06 × 72,821.10
  4. Step 4: Simplify right side
    130,191.72x = 13,082,751,910.87
  5. Step 5: Solve for x
    x = 13,082,751,910.87/130,191.72
  6. Step 6: Final answer
    x = 100,488.36

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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.