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Finding the Fourth Proportional to 90,965.80, 136,448.70 and 28,636.30

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Solution

The fourth proportional to 90,965.80, 136,448.70 and 28,636.30 is: 42,954.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,965.80 : 136,448.70 = 28,636.30 : x
  2. Step 2: Convert to fraction form
    90,965.80/136,448.70 = 28,636.30/x
  3. Step 3: Cross multiply
    90,965.80x = 136,448.70 × 28,636.30
  4. Step 4: Simplify right side
    90,965.80x = 3,907,385,907.81
  5. Step 5: Solve for x
    x = 3,907,385,907.81/90,965.80
  6. Step 6: Final answer
    x = 42,954.45

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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.