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Finding the Fourth Proportional to 125,999.70, 188,999.55 and 90,570.30

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Solution

The fourth proportional to 125,999.70, 188,999.55 and 90,570.30 is: 135,855.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,999.70 : 188,999.55 = 90,570.30 : x
  2. Step 2: Convert to fraction form
    125,999.70/188,999.55 = 90,570.30/x
  3. Step 3: Cross multiply
    125,999.70x = 188,999.55 × 90,570.30
  4. Step 4: Simplify right side
    125,999.70x = 17,117,745,943.37
  5. Step 5: Solve for x
    x = 17,117,745,943.37/125,999.70
  6. Step 6: Final answer
    x = 135,855.45

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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.