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Finding the Fourth Proportional to 90,647.80, 135,971.70 and 51,281.80

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Solution

The fourth proportional to 90,647.80, 135,971.70 and 51,281.80 is: 76,922.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,647.80 : 135,971.70 = 51,281.80 : x
  2. Step 2: Convert to fraction form
    90,647.80/135,971.70 = 51,281.80/x
  3. Step 3: Cross multiply
    90,647.80x = 135,971.70 × 51,281.80
  4. Step 4: Simplify right side
    90,647.80x = 6,972,873,525.06
  5. Step 5: Solve for x
    x = 6,972,873,525.06/90,647.80
  6. Step 6: Final answer
    x = 76,922.70

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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.