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Finding the Fourth Proportional to 90,644.32, 135,919.79 and 40,681.58

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Solution

The fourth proportional to 90,644.32, 135,919.79 and 40,681.58 is: 61,001.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,644.32 : 135,919.79 = 40,681.58 : x
  2. Step 2: Convert to fraction form
    90,644.32/135,919.79 = 40,681.58/x
  3. Step 3: Cross multiply
    90,644.32x = 135,919.79 × 40,681.58
  4. Step 4: Simplify right side
    90,644.32x = 5,529,431,607.06
  5. Step 5: Solve for x
    x = 5,529,431,607.06/90,644.32
  6. Step 6: Final answer
    x = 61,001.42

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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.