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Finding the Fourth Proportional to 90,435.80, 135,653.70 and 86,596.40

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Solution

The fourth proportional to 90,435.80, 135,653.70 and 86,596.40 is: 129,894.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,435.80 : 135,653.70 = 86,596.40 : x
  2. Step 2: Convert to fraction form
    90,435.80/135,653.70 = 86,596.40/x
  3. Step 3: Cross multiply
    90,435.80x = 135,653.70 × 86,596.40
  4. Step 4: Simplify right side
    90,435.80x = 11,747,122,066.68
  5. Step 5: Solve for x
    x = 11,747,122,066.68/90,435.80
  6. Step 6: Final answer
    x = 129,894.60

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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.