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Finding the Fourth Proportional to 90,653.80, 135,980.70 and 51,287.80

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Solution

The fourth proportional to 90,653.80, 135,980.70 and 51,287.80 is: 76,931.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,653.80 : 135,980.70 = 51,287.80 : x
  2. Step 2: Convert to fraction form
    90,653.80/135,980.70 = 51,287.80/x
  3. Step 3: Cross multiply
    90,653.80x = 135,980.70 × 51,287.80
  4. Step 4: Simplify right side
    90,653.80x = 6,974,150,945.46
  5. Step 5: Solve for x
    x = 6,974,150,945.46/90,653.80
  6. Step 6: Final answer
    x = 76,931.70

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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.