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Finding the Fourth Proportional to 280,111.53, 420,221.94 and 90,618.87

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Solution

The fourth proportional to 280,111.53, 420,221.94 and 90,618.87 is: 135,945.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,111.53 : 420,221.94 = 90,618.87 : x
  2. Step 2: Convert to fraction form
    280,111.53/420,221.94 = 90,618.87/x
  3. Step 3: Cross multiply
    280,111.53x = 420,221.94 × 90,618.87
  4. Step 4: Simplify right side
    280,111.53x = 38,080,037,352.01
  5. Step 5: Solve for x
    x = 38,080,037,352.01/280,111.53
  6. Step 6: Final answer
    x = 135,945.98

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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.