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Finding the Fourth Proportional to 280,378.19, 420,525.76 and 90,855.11

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Solution

The fourth proportional to 280,378.19, 420,525.76 and 90,855.11 is: 136,269.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,378.19 : 420,525.76 = 90,855.11 : x
  2. Step 2: Convert to fraction form
    280,378.19/420,525.76 = 90,855.11/x
  3. Step 3: Cross multiply
    280,378.19x = 420,525.76 × 90,855.11
  4. Step 4: Simplify right side
    280,378.19x = 38,206,914,182.63
  5. Step 5: Solve for x
    x = 38,206,914,182.63/280,378.19
  6. Step 6: Final answer
    x = 136,269.21

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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.