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Finding the Fourth Proportional to 90,913.55, 125,338.42 and 63,652.98

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Solution

The fourth proportional to 90,913.55, 125,338.42 and 63,652.98 is: 87,755.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,913.55 : 125,338.42 = 63,652.98 : x
  2. Step 2: Convert to fraction form
    90,913.55/125,338.42 = 63,652.98/x
  3. Step 3: Cross multiply
    90,913.55x = 125,338.42 × 63,652.98
  4. Step 4: Simplify right side
    90,913.55x = 7,978,163,676.92
  5. Step 5: Solve for x
    x = 7,978,163,676.92/90,913.55
  6. Step 6: Final answer
    x = 87,755.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.