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Finding the Fourth Proportional to 90,409.80, 135,614.70 and 86,570.40

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Solution

The fourth proportional to 90,409.80, 135,614.70 and 86,570.40 is: 129,855.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,409.80 : 135,614.70 = 86,570.40 : x
  2. Step 2: Convert to fraction form
    90,409.80/135,614.70 = 86,570.40/x
  3. Step 3: Cross multiply
    90,409.80x = 135,614.70 × 86,570.40
  4. Step 4: Simplify right side
    90,409.80x = 11,740,218,824.88
  5. Step 5: Solve for x
    x = 11,740,218,824.88/90,409.80
  6. Step 6: Final answer
    x = 129,855.60

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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.