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Finding the Fourth Proportional to 280,953.10, 421,429.65 and 278,328.70

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Solution

The fourth proportional to 280,953.10, 421,429.65 and 278,328.70 is: 417,493.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,953.10 : 421,429.65 = 278,328.70 : x
  2. Step 2: Convert to fraction form
    280,953.10/421,429.65 = 278,328.70/x
  3. Step 3: Cross multiply
    280,953.10x = 421,429.65 × 278,328.70
  4. Step 4: Simplify right side
    280,953.10x = 117,295,966,625.96
  5. Step 5: Solve for x
    x = 117,295,966,625.96/280,953.10
  6. Step 6: Final answer
    x = 417,493.05

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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.