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Finding the Fourth Proportional to 90,477.40, 135,845.70 and 51,111.40

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Solution

The fourth proportional to 90,477.40, 135,845.70 and 51,111.40 is: 76,740.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,477.40 : 135,845.70 = 51,111.40 : x
  2. Step 2: Convert to fraction form
    90,477.40/135,845.70 = 51,111.40/x
  3. Step 3: Cross multiply
    90,477.40x = 135,845.70 × 51,111.40
  4. Step 4: Simplify right side
    90,477.40x = 6,943,263,910.98
  5. Step 5: Solve for x
    x = 6,943,263,910.98/90,477.40
  6. Step 6: Final answer
    x = 76,740.31

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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.