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Finding the Fourth Proportional to 280,553.70, 420,889.64 and 90,999.24

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Solution

The fourth proportional to 280,553.70, 420,889.64 and 90,999.24 is: 136,518.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,553.70 : 420,889.64 = 90,999.24 : x
  2. Step 2: Convert to fraction form
    280,553.70/420,889.64 = 90,999.24/x
  3. Step 3: Cross multiply
    280,553.70x = 420,889.64 × 90,999.24
  4. Step 4: Simplify right side
    280,553.70x = 38,300,636,908.88
  5. Step 5: Solve for x
    x = 38,300,636,908.88/280,553.70
  6. Step 6: Final answer
    x = 136,518.02

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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.