Home / 280,690.28-421,063.76-91,142.72

Finding the Fourth Proportional to 280,690.28, 421,063.76 and 91,142.72

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Solution

The fourth proportional to 280,690.28, 421,063.76 and 91,142.72 is: 136,723.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,690.28 : 421,063.76 = 91,142.72 : x
  2. Step 2: Convert to fraction form
    280,690.28/421,063.76 = 91,142.72/x
  3. Step 3: Cross multiply
    280,690.28x = 421,063.76 × 91,142.72
  4. Step 4: Simplify right side
    280,690.28x = 38,376,896,379.83
  5. Step 5: Solve for x
    x = 38,376,896,379.83/280,690.28
  6. Step 6: Final answer
    x = 136,723.28

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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.