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Finding the Fourth Proportional to 90,783.70, 136,175.55 and 84,878.80

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Solution

The fourth proportional to 90,783.70, 136,175.55 and 84,878.80 is: 127,318.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,783.70 : 136,175.55 = 84,878.80 : x
  2. Step 2: Convert to fraction form
    90,783.70/136,175.55 = 84,878.80/x
  3. Step 3: Cross multiply
    90,783.70x = 136,175.55 × 84,878.80
  4. Step 4: Simplify right side
    90,783.70x = 11,558,417,273.34
  5. Step 5: Solve for x
    x = 11,558,417,273.34/90,783.70
  6. Step 6: Final answer
    x = 127,318.20

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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.