Home / 280,264.07-420,378.81-90,720.29

Finding the Fourth Proportional to 280,264.07, 420,378.81 and 90,720.29

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Solution

The fourth proportional to 280,264.07, 420,378.81 and 90,720.29 is: 136,074.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,264.07 : 420,378.81 = 90,720.29 : x
  2. Step 2: Convert to fraction form
    280,264.07/420,378.81 = 90,720.29/x
  3. Step 3: Cross multiply
    280,264.07x = 420,378.81 × 90,720.29
  4. Step 4: Simplify right side
    280,264.07x = 38,136,885,451.16
  5. Step 5: Solve for x
    x = 38,136,885,451.16/280,264.07
  6. Step 6: Final answer
    x = 136,074.83

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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.